title: Hubble Space Telescope

text: Hubble data was initially stored on the spacecraft. When launched, the storage facilities were old-fashioned reel-to-reel tape drives, but these were replaced by solid state data storage facilities during servicing missions2 and 3A. About twice daily, the Hubble Space Telescope radios data to a satellite in the geosynchronous Tracking and Data Relay Satellite System (TDRSS), which then downlinks the science data to one of two 60-foot (18-meter) diameter high-gain microwave antennas located at the White Sands Test Facility in White Sands, New Mexico. From there they are sent to the Space Telescope Operations Control Center at Goddard Space Flight Center, and finally to the Space Telescope Science Institute for archiving. Each week, HST downlinks approximately 140 gigabits of data.


title: Hubble Space Telescope

text: All images from Hubble are monochromatic grayscale, taken through a variety of filters, each passing specific wavelengths of light, and incorporated in each camera. Color images are created by combining separate monochrome images taken through different filters. This process can also create false-color versions of images including infrared and ultraviolet channels, where infrared is typically rendered as a deep red and ultraviolet is rendered as a deep blue.


title: Hubble Space Telescope

text: All Hubble data is eventually made available via the Mikulski Archive for Space Telescopes at STScI, CADC and ESA/ESAC. Data is usually proprietary—available only to the principal investigator (PI) and astronomers designated by the PI—for twelve months after being taken. The PI can apply to the director of the STScI to extend or reduce the proprietary period in some circumstances.


title: Hubble Space Telescope

text: Observations made on Director's Discretionary Time are exempt from the proprietary period, and are released to the public immediately. Calibration data such as flat fields and dark frames are also publicly available straight away. All data in the archive is in the FITS format, which is suitable for astronomical analysis but not for public use. The Hubble Heritage Project processes and releases to the public a small selection of the most striking images in JPEG and TIFF formats.


title: Hubble Space Telescope

text: Astronomical data taken with CCDs must undergo several calibration steps before they are suitable for astronomical analysis. STScI has developed sophisticated software that automatically calibrates data when they are requested from the archive using the best calibration files available. This 'on-the-fly' processing means large data requests can take a day or more to be processed and returned. The process by which data is calibrated automatically is known as 'pipeline reduction', and is increasingly common at major observatories. Astronomers may if they wish retrieve the calibration files themselves and run the pipeline reduction software locally. This may be desirable when calibration files other than those selected automatically need to be used.


title: Hubble Space Telescope

text: Hubble data can be analyzed using many different packages. STScI maintains the custom-made Space Telescope Science Data Analysis System (STSDAS) software, which contains all the programs needed to run pipeline reduction on raw data files, as well as many other astronomical image processing tools, tailored to the requirements of Hubble data. The software runs as a module of IRAF, a popular astronomical data reduction program.


title: Hubble Space Telescope

text: NASA considered it important for the Space Telescope to capture the public's imagination, given the considerable contribution of taxpayers to its construction and operational costs. After the difficult early years when the faulty mirror severely dented Hubble's reputation with the public, the first servicing mission allowed its rehabilitation as the corrected optics produced numerous remarkable images.


title: Hubble Space Telescope

text: In the United States, outreach efforts are coordinated by the Space Telescope Science Institute (STScI) Office for Public Outreach, which was established in 2000 to ensure that U.S. taxpayers saw the benefits of their investment in the space telescope program. To that end, STScI operates the HubbleSite.org website. The Hubble Heritage Project, operating out of the STScI, provides the public with high-quality images of the most interesting and striking objects observed. The Heritage team is composed of amateur and professional astronomers, as well as people with backgrounds outside astronomy, and emphasizes the aesthetic nature of Hubble images. The Heritage Project is granted a small amount of time to observe objects which, for scientific reasons, may not have images taken at enough wavelengths to construct a full-color image.


title: Hubble Space Telescope

text: Since 1999, the leading Hubble outreach group in Europe has been the Hubble European Space Agency Information Centre (HEIC). This office was established at the Space Telescope European Coordinating Facility in Munich, Germany. HEIC's mission is to fulfill HST outreach and education tasks for the European Space Agency. The work is centered on the production of news and photo releases that highlight interesting Hubble results and images. These are often European in origin, and so increase awareness of both ESA's Hubble share (15%) and the contribution of European scientists to the observatory. ESA produces educational material, including a videocast series called Hubblecast designed to share world-class scientific news with the public.


title: Hubble Space Telescope

text: The Hubble Space Telescope has won two Space Achievement Awards from the Space Foundation, for its outreach activities, in 2001 and 2010.


title: Hubble Space Telescope

text: A replica of the Hubble Space Telescope is on the courthouse lawn in Marshfield, Missouri, the hometown of namesake Edwin P. Hubble.


title: Hubble Space Telescope

text: The Hubble Space Telescope celebrated its 20th anniversary in space on April 24, 2010. To commemorate the occasion, NASA, ESA, and the Space Telescope Science Institute (STScI) released an image from the Carina Nebula.


title: Hubble Space Telescope

text: To commemorate Hubble's 25th anniversary in space on April 24, 2015, STScI released images of the Westerlund 2 cluster, located about away in the constellation Carina, through its Hubble 25 website. The European Space Agency created a dedicated 25th anniversary page on its website. In April 2016, a special celebratory image of the Bubble Nebula was released for Hubble's 26th "birthday".


title: Hubble Space Telescope

text: HST uses gyroscopes to detect and measure any rotations so it can stabilize itself in orbit and point accurately and steadily at astronomical targets. Three gyroscopes are normally required for operation; observations are still possible with two or one, but the area of sky that can be viewed would be somewhat restricted, and observations requiring very accurate pointing are more difficult. In 2018, the plan was to drop into one-gyroscope mode if fewer than three working gyroscopes were operational. The gyroscopes are part of the Pointing Control System, which uses five types of sensors (magnetic sensors, optical sensors, and the gyroscopes) and two types of actuators (reaction wheels and magnetic torquers).


title: Hubble Space Telescope

text: After the "Columbia" disaster in 2003, it was unclear whether another servicing mission would be possible, and gyroscope life became a concern again, so engineers developed new software for two-gyroscope and one-gyroscope modes to maximize the potential lifetime. The development was successful, and in 2005, it was decided to switch to two-gyroscope mode for regular telescope operations as a means of extending the lifetime of the mission. The switch to this mode was made in August 2005, leaving Hubble with two gyroscopes in use, two on backup, and two inoperable. One more gyroscope failed in 2007.


title: Hubble Space Telescope

text: By the time of the final repair mission in May 2009, during which all six gyroscopes were replaced (with two new pairs and one refurbished pair), only three were still working. Engineers determined that the gyroscope failures were caused by corrosion of electric wires powering the motor that was initiated by oxygen-pressurized air used to deliver the thick suspending fluid. The new gyroscope models were assembled using pressurized nitrogen and were expected to be much more reliable. In the 2009 servicing mission all six gyroscopes were replaced, and after almost ten years only three gyroscopes failed, and only after exceeding the average expected run time for the design.


title: Hubble Space Telescope

text: Of the six gyroscopes replaced in 2009, three were of the old design susceptible for flex-lead failure, and three were of the new design with a longer expected lifetime. The first of the old-style gyroscopes failed in March 2014, and the second in April 2018. On October 5, 2018, the last of the old-style gyroscopes failed, and one of the new-style gyroscopes was powered-up from standby state. However, that reserve gyroscope did not immediately perform within operational limits, and so the observatory was placed into "safe" mode while scientists attempted to fix the problem. NASA tweeted on October 22, 2018, that the "rotation rates produced by the backup gyro have reduced and are now within a normal range. Additional tests to be performed to ensure Hubble can return to science operations with this gyro."


title: Hubble Space Telescope

text: The solution that restored the backup new-style gyroscope to operational range was widely reported as "turning it off and on again". A "running restart" of the gyroscope was performed, but this had no effect, and the final resolution to the failure was more complex. The failure was attributed to an inconsistency in the fluid surrounding the float within the gyroscope (e.g., an air bubble). On October 18, 2018, the Hubble Operations Team directed the spacecraft into a series of maneuvers—moving the spacecraft in opposite directions—in order to mitigate the inconsistency. Only after the maneuvers, and a subsequent set of maneuvers on October 19, did the gyroscope truly operate within its normal range.


title: Hubble Space Telescope

text: Past servicing missions have exchanged old instruments for new ones, avoiding failure and making new types of science possible. Without servicing missions, all the instruments will eventually fail. In August 2004, the power system of the Space Telescope Imaging Spectrograph (STIS) failed, rendering the instrument inoperable. The electronics had originally been fully redundant, but the first set of electronics failed in May 2001. This power supply was fixed during Servicing Mission4 in May 2009.


title: Hubble Space Telescope

text: Similarly, the Advanced Camera for Surveys (ACS) main camera primary electronics failed in June 2006, and the power supply for the backup electronics failed on January 27, 2007. Only the instrument's Solar Blind Channel (SBC) was operable using the side-1 electronics. A new power supply for the wide angle channel was added during SM 4, but quick tests revealed this did not help the high resolution channel. The Wide Field Channel (WFC) was returned to service by STS-125 in May 2009 but the High Resolution Channel (HRC) remains offline.


title: Hubble Space Telescope

text: On January 8, 2019, Hubble entered a partial safe mode following suspected hardware problems in its most advanced instrument, the Wide Field Camera 3 instrument. NASA later reported that the cause of the safe mode within the instrument was a detection of voltage levels out of a defined range. On January 15, 2019, NASA said the cause of the failure was a software problem. Engineering data within the telemetry circuits were not accurate. In addition, all other telemetry within those circuits also contained erroneous values indicating that this was a telemetry issue and not a power supply issue. After resetting the telemetry circuits and associated boards the instrument began functioning again. On January 17, 2019, the device was returned to normal operation and on the same day it completed its first science observations.


title: Hubble Space Telescope

text: On June 13, 2021, Hubble's payload computer halted due to a suspected issue with a memory module. An attempt to restart the computer on June 14 failed. Further attempts to switch to one of three other backup memory modules on board the spacecraft failed on June 18. On June 23 and 24, NASA engineers switched Hubble to a backup payload computer, but these operations have failed as well with the same error. On June 28, 2021, NASA announced that it was extending the investigation to other components. Scientific operations were suspended while NASA worked to diagnose and resolve the issue. After identifying a malfunctioning power control unit (PCU) supplying power to one of Hubble's computers, NASA was able to switch to a backup PCU and bring Hubble back to operational mode on July 16. On October 23, 2021, HST instruments reported missing synchronization messages and went into safe mode. By December 8, 2021, NASA had restored full science operations and was developing updates to make instruments more resilient to missing synchronization messages.


title: Hubble Space Telescope

text: Hubble orbits the Earth in the extremely tenuous upper atmosphere, and over time its orbit decays due to drag. If not reboosted, it will re-enter the Earth's atmosphere within some decades, with the exact date depending on how active the Sun is and its impact on the upper atmosphere. If Hubble were to descend in a completely uncontrolled re-entry, parts of the main mirror and its support structure would probably survive, leaving the potential for damage or even human fatalities. In 2013, deputy project manager James Jeletic projected that Hubble could survive into the 2020s. Based on solar activity and atmospheric drag, or lack thereof, a natural atmospheric reentry for Hubble will occur between 2028 and 2040. In June 2016, NASA extended the service contract for Hubble until June 2021. In November 2021, NASA extended the service contract for Hubble until June 2026.


title: Hubble Space Telescope

text: NASA's original plan for safely de-orbiting Hubble was to retrieve it using a Space Shuttle. Hubble would then have most likely been displayed in the Smithsonian Institution. This is no longer possible since the Space Shuttle fleet has been retired, and would have been unlikely in any case due to the cost of the mission and risk to the crew. Instead, NASA considered adding an external propulsion module to allow controlled re-entry. Ultimately, in 2009, as part of Servicing Mission 4, the last servicing mission by the Space Shuttle, NASA installed the Soft Capture Mechanism (SCM), to enable deorbit by either a crewed or robotic mission. The SCM, together with the Relative Navigation System (RNS), mounted on the Shuttle to collect data to "enable NASA to pursue numerous options for the safe de-orbit of Hubble", constitute the Soft Capture and Rendezvous System (SCRS).


title: Hubble Space Telescope

text: , the Trump Administration was considering a proposal by the Sierra Nevada Corporation to use a crewed version of its Dream Chaser spacecraft to service "Hubble" some time in the 2020s both as a continuation of its scientific capabilities and as insurance against any malfunctions in the James Webb Space Telescope. In 2020, John Grunsfeld said that SpaceX Crew Dragon or Orion could perform another repair mission within ten years. While robotic technology is not yet sophisticated enough, he said, with another crewed visit "We could keep Hubble going for another few decades" with new gyros and instruments.


title: Hubble Space Telescope

text: In September 2022, NASA and SpaceX signed a Space Act Agreement to investigate the possibility of launching a Crew Dragon mission to service and boost Hubble to a higher orbit, possibly extending its lifespan by another 20 years.


title: Hubble Space Telescope

text: There is no direct replacement to Hubble as an ultraviolet and visible light space telescope, because near-term space telescopes do not duplicate Hubble's wavelength coverage (near-ultraviolet to near-infrared wavelengths), instead concentrating on the further infrared bands. These bands are preferred for studying high redshift and low-temperature objects, objects generally older and farther away in the universe. These wavelengths are also difficult or impossible to study from the ground, justifying the expense of a space-based telescope. Large ground-based telescopes can image some of the same wavelengths as Hubble, sometimes challenge HST in terms of resolution by using adaptive optics (AO), have much larger light-gathering power, and can be upgraded more easily, but cannot yet match Hubble's excellent resolution over a wide field of view with the very dark background of space.


title: Hubble Space Telescope

text: Plans for a Hubble successor materialized as the Next Generation Space Telescope project, which culminated in plans for the James Webb Space Telescope (JWST), the formal successor of Hubble. Very different from a scaled-up Hubble, it is designed to operate colder and farther away from the Earth at the L2 Lagrangian point, where thermal and optical interference from the Earth and Moon are lessened. It is not engineered to be fully serviceable (such as replaceable instruments), but the design includes a docking ring to enable visits from other spacecraft. A main scientific goal of JWST is to observe the most distant objects in the universe, beyond the reach of existing instruments. It is expected to detect stars in the early Universe approximately 280 million years older than stars HST now detects. The telescope is an international collaboration between NASA, the European Space Agency, and the Canadian Space Agency since 1996, and was launched on December 25, 2021, on an Ariane 5 rocket. Although JWST is primarily an infrared instrument, its coverage extends down to 600 nm wavelength light, or roughly orange in the visible spectrum. A typical human eye can see to about 750 nm wavelength light, so there is some overlap with the longest visible wavelength bands, including orange and red light.


title: Hubble Space Telescope

text: A complementary telescope, looking at even longer wavelengths than Hubble or JWST, was the European Space Agency's Herschel Space Observatory, launched on May 14, 2009. Like JWST, Herschel was not designed to be serviced after launch, and had a mirror substantially larger than Hubble's, but observed only in the far infrared and submillimeter. It needed helium coolant, of which it ran out on April 29, 2013.


title: Hubble Space Telescope

text: Further concepts for advanced 21st-century space telescopes include the Large Ultraviolet Optical Infrared Surveyor (LUVOIR), a conceptualized optical space telescope that if realized could be a more direct successor to HST, with the ability to observe and photograph astronomical objects in the visible, ultraviolet, and infrared wavelengths, with substantially better resolution than Hubble or the Spitzer Space Telescope. The final planning report, prepared for the 2020 Astronomy and Astrophysics Decadal Survey, suggested a launch date of 2039. The Decadal Survey eventually recommended that ideas for LUVOIR be combined with the Habitable Exoplanet Observer proposal to devise a new, 6-meter flagship telescope that could launch in the 2040s.


title: Hubble Space Telescope

text: Existing ground-based telescopes, and various proposed Extremely Large Telescopes, can exceed the HST in terms of sheer light-gathering power and diffraction limit due to larger mirrors, but other factors affect telescopes. In some cases, they may be able to match or exceed Hubble in resolution by using adaptive optics (AO). However, AO on large ground-based reflectors will not make Hubble and other space telescopes obsolete. Most AO systems sharpen the view over a very narrow field—Lucky Cam, for example, produces crisp images just 10 to 20 arcseconds wide, whereas Hubble's cameras produce crisp images across a 150 arcsecond (2½ arcminutes) field. Furthermore, space telescopes can study the universe across the entire electromagnetic spectrum, most of which is blocked by Earth's atmosphere. Finally, the background sky is darker in space than on the ground, because air absorbs solar energy during the day and then releases it at night, producing a faint—but nevertheless discernible—airglow that washes out low-contrast astronomical objects.


title: Sperm whale

text: The sperm whale or cachalot (Physeter macrocephalus) is the largest of the toothed whales and the largest toothed predator. It is the only living member of the genus "Physeter" and one of three extant species in the sperm whale family, along with the pygmy sperm whale and dwarf sperm whale of the genus "Kogia".


title: Sperm whale

text: The sperm whale is a pelagic mammal with a worldwide range, and will migrate seasonally for feeding and breeding. Females and young males live together in groups, while mature males (bulls) live solitary lives outside of the mating season. The females cooperate to protect and nurse their young. Females give birth every four to twenty years, and care for the calves for more than a decade. A mature sperm whale has few natural predators, although calves and weakened adults are sometimes killed by pods of killer whales (orcas).


title: Sperm whale

text: Mature males average in length, with the head representing up to one-third of the animal's length. Plunging to , it is the third deepest diving mammal, exceeded only by the southern elephant seal and Cuvier's beaked whale. The sperm whale uses echolocation and vocalization as loud as 230 decibels (re 1 µPa m) underwater. It has the largest brain on Earth, more than five times heavier than a human's. Sperm whales can live 70 years or more.


title: Sperm whale

text: Spermaceti (sperm oil), from which the whale derives its name, was a prime target of the whaling industry, and was sought after for use in oil lamps, lubricants, and candles. Ambergris, a solid waxy waste product sometimes present in its digestive system, is still highly valued as a fixative in perfumes, among other uses. Beachcombers look out for ambergris as flotsam. Sperm whaling was a major industry in the 19th century, depicted in the novel "Moby-Dick". The species is protected by the International Whaling Commission moratorium, and is listed as vulnerable by the International Union for Conservation of Nature.


title: Sperm whale

text: The name "sperm whale" is a clipping of "spermaceti whale". Spermaceti, originally mistakenly identified as the whales' semen, is the semi-liquid, waxy substance found within the whale's head.


title: Sperm whale

text: The sperm whale is also known as the "cachalot", which is thought to derive from the archaic French for 'tooth' or 'big teeth', as preserved for example in the word in the Gascon dialect (a word of either Romance


title: Sperm whale

text: The etymological dictionary of Corominas says the origin is uncertain, but it suggests that it comes from the Vulgar Latin 'sword hilts'. The word "cachalot" came to English via French from Spanish or Portuguese , perhaps from Galician/Portuguese 'big head'.


title: Sperm whale

text: The scientific genus name "Physeter" comes from the Greek (), meaning 'blowpipe, blowhole (of a whale)', or – as a "pars pro toto" – 'whale'.


title: Sperm whale

text: Its synonymous specific name "catodon" means 'down-tooth', from the Greek elements ('below') and ('tooth'); so named because it has visible teeth only in its lower jaw. ("See "Jaws and teeth" below.")


title: Sperm whale

text: Another synonym "australasianus" ('Australasian') was applied to sperm whales in the Southern Hemisphere.


title: Sperm whale

text: The sperm whale belongs to the order Cetartiodactyla, the order containing all cetaceans and even-toed ungulates. It is a member of the unranked clade Cetacea, with all the whales, dolphins, and porpoises, and further classified into Odontoceti, containing all the toothed whales and dolphins. It is the sole extant species of its genus, "Physeter", in the family Physeteridae. Two species of the related extant genus "Kogia", the pygmy sperm whale "Kogia breviceps" and the dwarf sperm whale "K. sima", are placed either in this family or in the family Kogiidae. In some taxonomic schemes the families Kogiidae and Physeteridae are combined as the superfamily Physeteroidea (see the separate entry on the sperm whale family).


title: Sperm whale

text: Swedish ichthyologist Peter Artedi described it as "Physeter catodon" in his 1738 work "Genera piscium", from the report of a beached specimen in the Orkneys in 1693 and two beached in the Netherlands in 1598 and 1601. The 1598 specimen was near Berkhey.


title: Sperm whale

text: The sperm whale is one of the species originally described by Carl Linnaeus in his landmark 1758 10th edition of "Systema Naturae". He recognised four species in the genus "Physeter". Experts soon realised that just one such species exists, although there has been debate about whether this should be named "P. catodon" or "P. macrocephalus", two of the names used by Linnaeus. Both names are still used, although most recent authors now accept "macrocephalus" as the valid name, limiting "catodon" status to a lesser synonym. Until 1974, the species was generally known as "P. catodon". In that year, however, Dutch zoologists Antonius M. Husson and Lipke Holthuis proposed that the correct name should be "P. macrocephalus", the second name in the genus "Physeter" published by Linnaeus concurrently with "P. catodon". This proposition was based on the grounds that the names were synonyms published simultaneously, and, therefore, the ICZN Principle of the First Reviser should apply. In this instance, it led to the choice of "P. macrocephalus" over "P. catodon", a view re-stated in Holthuis, 1987. This has been adopted by most subsequent authors, although Schevill (1986 and 1987) argued that "macrocephalus" was published with an inaccurate description and that therefore only the species "catodon" was valid, rendering the principle of "First Reviser" inapplicable. The most recent version of ITIS has altered its usage from "P. catodon" to "P. macrocephalus", following L. B. Holthuis and more recent (2008) discussions with relevant experts. Furthermore, The Taxonomy Committee of the Society for Marine Mammalogy, the largest international association of marine mammal scientists in the world, officially uses "Physeter macrocephalus" when publishing their definitive list of marine mammal species.


title: Sperm whale

text: The sperm whale is the largest toothed whale and is among the most sexually dimorphic of all cetaceans. Both sexes are about the same size at birth, but mature males are typically 30% to 50% longer and three times as massive as females.


title: Sperm whale

text: Newborn sperm whales are usually between long. Female sperm whales are sexually mature at in length, whilst males are sexually mature at . Female sperm whales are physically mature at about in length and generally do not achieve lengths greater than . Male sperm whales are physically mature at about in length, and larger males can generally achieve . An sperm whale was weighed whole. By contrast, the second largest toothed whale (Baird's beaked whale) measures up to and weighs up to .


title: Sperm whale

text: There are occasional reports of individual sperm whales achieving even greater lengths, with some historical claims reaching or exceeding . One example is the whale that sank the "Essex" (one of the incidents behind "Moby-Dick"), which was claimed to be . However, there is disagreement as to the accuracy of some of these claims, which are often considered exaggerations or as being measured along the curves of the body.


title: Sperm whale

text: An individual measuring was reported from a Soviet whaling fleet near the Kuril Islands in 1950 and is cited by some authors as the largest accurately measured. It has been estimated to weigh . In a review of size variation in marine megafauna, McClain and colleagues noted that the International Whaling Commission's data contained eight individuals larger than . The authors supported a male from the South Pacific in 1933 as the largest recorded. However, sizes like these are rare, with 95% of recorded sperm whales below 15.85 metres (52.0 ft).


title: Sperm whale

text: In 1853, one sperm whale was reported at in length, with a head measuring . Large lower jawbones are held in the British Natural History Museum and the Oxford University Museum of Natural History, measuring and , respectively.


title: Sperm whale

text: The average size of sperm whales has decreased over the years, probably due to pressure from whaling. Another view holds that exploitation by overwhaling had virtually no effect on the size of the bull sperm whales, and their size may have actually increased in current times on the basis of density dependent effects. Old males taken at Solander Islands were recorded to be extremely large and unusually rich in blubbers.


title: Sperm whale

text: The sperm whale's unique body is unlikely to be confused with any other species. The sperm whale's distinctive shape comes from its very large, block-shaped head, which can be one-quarter to one-third of the animal's length. The S-shaped blowhole is located very close to the front of the head and shifted to the whale's left. This gives rise to a distinctive bushy, forward-angled spray.


title: Sperm whale

text: The sperm whale's flukes (tail lobes) are triangular and very thick. Proportionally, they are larger than that of any other cetacean, and are very flexible. The whale lifts its flukes high out of the water as it begins a feeding dive. It has a series of ridges on the back's caudal third instead of a dorsal fin. The largest ridge was called the 'hump' by whalers, and can be mistaken for a dorsal fin because of its shape and size.


title: Sperm whale

text: In contrast to the smooth skin of most large whales, its back skin is usually wrinkly and has been likened to a prune by whale-watching enthusiasts. Albinos have been reported.


title: Sperm whale

text: The ribs are bound to the spine by flexible cartilage, which allows the ribcage to collapse rather than snap under high pressure. While sperm whales are well adapted to diving, repeated dives to great depths have long-term effects. Bones show the same pitting that signals decompression sickness in humans. Older skeletons showed the most extensive pitting, whereas calves showed no damage. This damage may indicate that sperm whales are susceptible to decompression sickness, and sudden surfacing could be lethal to them.


title: Sperm whale

text: Like that of all cetaceans, the spine of the sperm whale has reduced zygapophysial joints, of which the remnants are modified and are positioned higher on the vertebral dorsal spinous process, hugging it laterally, to prevent extensive lateral bending and facilitate more dorso-ventral bending. These evolutionary modifications make the spine more flexible but weaker than the spines of terrestrial vertebrates.


title: Sperm whale

text: Like that of other toothed whales, the skull of the sperm whale is asymmetrical so as to aid echolocation. Sound waves that strike the whale from different directions will not be channeled in the same way. Within the basin of the cranium, the openings of the bony narial tubes (from which the nasal passages spring) are skewed towards the left side of the skull.


title: Sperm whale

text: The sperm whale's lower jaw is very narrow and underslung. The sperm whale has 18 to 26 teeth on each side of its lower jaw which fit into sockets in the upper jaw. The teeth are cone-shaped and weigh up to each. The teeth are functional, but do not appear to be necessary for capturing or eating squid, as well-fed animals have been found without teeth or even with deformed jaws. One hypothesis is that the teeth are used in aggression between males. Mature males often show scars which seem to be caused by the teeth. Rudimentary teeth are also present in the upper jaw, but these rarely emerge into the mouth. Analyzing the teeth is the preferred method for determining a whale's age. Like the age-rings in a tree, the teeth build distinct layers of cementum and dentine as they grow.


title: Sperm whale

text: The sperm whale brain is the largest known of any modern or extinct animal, weighing on average about (with the smallest known weighing and the largest known weighing ), more than five times heavier than a human's, and has a volume of about 8,000 cm. Although larger brains generally correlate with higher intelligence, it is not the only factor. Elephants and dolphins also have larger brains than humans. The sperm whale has a lower encephalization quotient than many other whale and dolphin species, lower than that of non-human anthropoid apes, and much lower than humans'.


title: Sperm whale

text: The sperm whale's cerebrum is the largest in all mammalia, both in absolute and relative terms. The olfactory system is reduced, suggesting that the sperm whale has a poor sense of taste and smell. By contrast, the auditory system is enlarged. The pyramidal tract is poorly developed, reflecting the reduction of its limbs.


title: Sperm whale

text: The sperm whale respiratory system has adapted to cope with drastic pressure changes when diving. The flexible ribcage allows lung collapse, reducing nitrogen intake, and metabolism can decrease to conserve oxygen. Between dives, the sperm whale surfaces to breathe for about eight minutes before diving again. Odontoceti (toothed whales) breathe air at the surface through a single, S-shaped blowhole, which is extremely skewed to the left. Sperm whales spout (breathe) 3–5 times per minute at rest, increasing to 6–7 times per minute after a dive. The blow is a noisy, single stream that rises up to or more above the surface and points forward and left at a 45° angle. On average, females and juveniles blow every 12.5 seconds before dives, while large males blow every 17.5 seconds before dives. A sperm whale killed south of Durban, South Africa, after a 1-hour, 50-minute dive was found with two dogfish (Scymnodon sp.), usually found at the sea floor, in its belly.


title: Sperm whale

text: The sperm whale has the longest intestinal system in the world, exceeding 300 m in larger specimens. Similar to ruminants the sperm whale has a four-chambered stomach. The first secretes no gastric juices and has very thick muscular walls to crush the food (since whales cannot chew) and resist the claw and sucker attacks of swallowed squid. The second chamber is larger and is where digestion takes place. Undigested squid beaks accumulate in the second chamber – as many as 18,000 have been found in some dissected specimens. Most squid beaks are vomited by the whale, but some occasionally make it to the hindgut. Such beaks precipitate the formation of ambergris.


title: Sperm whale

text: In 1959, the heart of a 22 metric-ton (24 short-ton) male taken by whalers was measured to be , about 0.5% of its total mass. The circulatory system has a number of specific adaptations for the aquatic environment. The diameter of the aortic arch increases as it leaves the heart. This bulbous expansion acts as a windkessel, ensuring a steady blood flow as the heart rate slows during diving. The arteries that leave the aortic arch are positioned symmetrically. There is no costocervical artery. There is no direct connection between the internal carotid artery and the vessels of the brain. Their circulatory system has adapted to dive at great depths, as much as for up to 120 minutes. More typical dives are around and 35 minutes in duration. Myoglobin, which stores oxygen in muscle tissue, is much more abundant than in terrestrial animals. The blood has a high density of red blood cells, which contain oxygen-carrying haemoglobin. The oxygenated blood can be directed towards only the brain and other essential organs when oxygen levels deplete. The spermaceti organ may also play a role by adjusting buoyancy (see below). The arterial retia mirabilia are extraordinarily well-developed. The complex arterial retia mirabilia of the sperm whale are more extensive and larger than those of any other cetacean.


title: Sperm whale

text: Atop the whale's skull is positioned a large complex of organs filled with a liquid mixture of fats and waxes called spermaceti. The purpose of this complex is to generate powerful and focused clicking sounds, the existence of which was proven by Valentine Worthington, and William Schevill when a recording was produced on a research vessel in May 1959. The sperm whale uses these sounds for echolocation and communication.


title: Sperm whale

text: The spermaceti organ is like a large barrel of spermaceti. Its surrounding wall, known as the "case", is extremely tough and fibrous. The case can hold within it up to 1,900 litres of spermaceti. It is proportionately larger in males. This oil is a mixture of triglycerides and wax esters. The proportion of wax esters in the spermaceti organ increases with the age of the whale: 38–51% in calves, 58–87% in adult females, and 71–94% in adult males. The spermaceti at the core of the organ has a higher wax content than the outer areas. The speed of sound in spermaceti is 2,684 m/s (at 40 kHz, 36 °C), making it nearly twice as fast as in the oil in a dolphin's melon.


title: Sperm whale

text: Below the spermaceti organ lies the "junk" which consists of compartments of spermaceti separated by cartilage. It is analogous to the melon found in other toothed whales. The structure of the junk redistributes physical stress across the skull and may have evolved to protect the head during ramming.


title: Sperm whale

text: Running through the head are two air passages. The left passage runs alongside the spermaceti organ and goes directly to the blowhole, whilst the right passage runs underneath the spermaceti organ and passes air through a pair of phonic lips and into the distal sac at the very front of the nose. The distal sac is connected to the blowhole and the terminus of the left passage. When the whale is submerged, it can close the blowhole, and air that passes through the phonic lips can circulate back to the lungs. The sperm whale, unlike other odontocetes, has only one pair of phonic lips, whereas all other toothed whales have two, and it is located at the front of the nose instead of behind the melon.


title: Sperm whale

text: At the posterior end of this spermaceti complex is the frontal sac, which covers the concave surface of the cranium. The posterior wall of the frontal sac is covered with fluid-filled knobs, which are about 4–13 mm in diameter and separated by narrow grooves. The anterior wall is smooth. The knobbly surface reflects sound waves that come through the spermaceti organ from the phonic lips. The grooves between the knobs trap a film of air that is consistent whatever the orientation or depth of the whale, making it an excellent sound mirror.


title: Sperm whale

text: The spermaceti organs may also help adjust the whale's buoyancy. It is hypothesized that before the whale dives, cold water enters the organ, and it is likely that the blood vessels constrict, reducing blood flow, and, hence, temperature. The wax therefore solidifies and reduces in volume. The increase in specific density generates a down force of about and allows the whale to dive with less effort. During the hunt, oxygen consumption, together with blood vessel dilation, produces heat and melts the spermaceti, increasing its buoyancy and enabling easy surfacing. However, more recent work has found many problems with this theory including the lack of anatomical structures for the actual heat exchange. Another issue is that if the spermaceti does indeed cool and solidify, it would affect the whale's echolocation ability just when it needs it to hunt in the depths.


title: Sperm whale

text: Herman Melville's fictional story "Moby-Dick" suggests that the "case" containing the spermaceti serves as a battering ram for use in fights between males. A few famous instances include the well-documented sinking of the ships "Essex" and "Ann Alexander" by attackers estimated to weigh only one-fifth as much as the ships.


title: Sperm whale

text: The sperm whale's eye does not differ greatly from those of other toothed whales except in size. It is the largest among the toothed whales, weighing about 170 g. It is overall ellipsoid in shape, compressed along the visual axis, measuring about 7×7×3 cm. The cornea is elliptical and the lens is spherical. The sclera is very hard and thick, roughly 1 cm anteriorly and 3 cm posteriorly. There are no ciliary muscles. The choroid is very thick and contains a fibrous "tapetum lucidum". Like other toothed whales, the sperm whale can retract and protrude its eyes, thanks to a 2-cm-thick retractor muscle attached around the eye at the equator, but are unable to roll the eyes in their sockets.


title: Sperm whale

text: sperm whale's eyes afford good vision and sensitivity to light. They conjectured that sperm whales use vision to hunt squid, either by detecting silhouettes from below or by detecting bioluminescence. If sperm whales detect silhouettes, Fristrup and Harbison suggested that they hunt upside down, allowing them to use the forward parts of the ventral visual fields for binocular vision.


title: Sperm whale

text: For some time researchers have been aware that pods of sperm whales may sleep for short periods, assuming a vertical position with their heads just below or at the surface, or head down. A 2008 study published in "Current Biology" recorded evidence that whales may sleep with both sides of the brain. It appears that some whales may fall into a deep sleep for about 7 percent of the time, most often between 6 p.m. and midnight.


title: Sperm whale

text: Sperm whales have 21 pairs of chromosomes (2n=42). The genome of live whales can be examined by recovering shed skin.


title: Sperm whale

text: After the discovery by Valentine Worthington and William Schevill confirmed the existence of whale vocalization further studies conducted found that sperm whales are capable of emitting sounds at a volume of 230 decibels–more than an airplane jet engine at takeoff–the sperm whale is the loudest animal in the world. Sperm whale vocalization is a learned behavior that is clan specific.


title: Sperm whale

text: When echolocating, the sperm whale emits a directionally focused beam of broadband clicks. Clicks are generated by forcing air through a pair of phonic lips (also known as "monkey lips" or "museau de singe") at the front end of the nose, just below the blowhole. The sound then travels backwards along the length of the nose through the spermaceti organ. Most of the sound energy is then reflected off the frontal sac at the cranium and into the melon, whose lens-like structure focuses it. Some of the sound will reflect back into the spermaceti organ and back towards the front of the whale's nose, where it will be reflected through the spermaceti organ a third time. This back and forth reflection which happens on the scale of a few milliseconds creates a multi-pulse click structure. This multi-pulse click structure allows researchers to measure the whale's spermaceti organ using only the sound of its clicks. Because the interval between pulses of a sperm whale's click is related to the length of the sound producing organ, an individual whale's click is unique to that individual. However, if the whale matures and the size of the spermaceti organ increases, the tone of the whale's click will also change. The lower jaw is the primary reception path for the echoes. A continuous fat-filled canal transmits received sounds to the inner ear.


title: Sperm whale

text: The source of the air forced through the phonic lips is the right nasal passage. While the left nasal passage opens to the blow hole, the right nasal passage has evolved to supply air to the phonic lips. It is thought that the nostrils of the land-based ancestor of the sperm whale migrated through evolution to their current functions, the left nostril becoming the blowhole and the right nostril becoming the phonic lips.


title: Sperm whale

text: Air that passes through the phonic lips passes into the distal sac, then back down through the left nasal passage. This recycling of air allows the whale to continuously generate clicks for as long as it is submerged.


title: Sperm whale

text: A creak is a rapid series of high-frequency clicks that sounds somewhat like a creaky door hinge. It is typically used when homing in on prey.


title: Sperm whale

text: A coda is a short pattern of 3 to 20 clicks that is used in social situations. They were once thought to be a way by which individuals identified themselves, but individuals have been observed producing multiple codas, and the same codas are used by multiple individuals. However, each click contains a physical signature which suggests that clicks can be used to identify individuals. Geographically separate pods exhibit distinct dialects. Large males are generally solitary and rarely produce codas. In breeding grounds, codas are almost entirely produced by adult females. Despite evidence that sperm whales share similar codas, it is still unknown whether sperm whales possess individually specific coda repertoires or whether individuals make codas at different rates.


title: Sperm whale

text: Slow clicks are heard only in the presence of males (it is not certain whether females occasionally make them). Males make a lot of slow clicks in breeding grounds (74% of the time), both near the surface and at depth, which suggests they are primarily mating signals. Outside breeding grounds, slow clicks are rarely heard, and usually near the surface.


title: Sperm whale

text: Sperm whales are among the most cosmopolitan species. They prefer ice-free waters over deep. Although both sexes range through temperate and tropical oceans and seas, only adult males populate higher latitudes. Among several regions, such as along coastal waters of southern Australia, sperm whales have been considered to be locally extinct.


title: Sperm whale

text: They are relatively abundant from the poles to the equator and are found in all the oceans. They inhabit the Mediterranean Sea, but not the Black Sea, while their presence in the Red Sea is uncertain. The shallow entrances to both the Black Sea and the Red Sea may account for their absence. The Black Sea's lower layers are also anoxic and contain high concentrations of sulphur compounds such as hydrogen sulphide. The first ever sighting off the coast of Pakistan was made in 2017. The first ever record off the west coast of the Korean Peninsula (Yellow Sea) was made in 2005. followed by one near Ganghwa Island in 2009.


title: Sperm whale

text: Populations are denser close to continental shelves and canyons. Sperm whales are usually found in deep, off-shore waters, but may be seen closer to shore, in areas where the continental shelf is small and drops quickly to depths of . Coastal areas with significant sperm whale populations include the Azores and Dominica. In east Asian waters, whales are also observed regularly in coastal waters in places such as the Commander and Kuril Islands, Shiretoko Peninsula which is one of few locations where sperm whales can be observed from shores, off Kinkasan, vicinity to Tokyo Bay and the Bōsō Peninsula to the Izu and the Izu Islands, the Volcano Islands, Yakushima and the Tokara Islands to the Ryukyu Islands,Taiwan, the Northern Mariana Islands, and so forth. Historical catch records suggest there could have been smaller aggression grounds in the Sea of Japan as well. Along the Korean Peninsula, the first confirmed observation within the Sea of Japan, eight animals off Guryongpo, was made in 2004 since after the last catches of five whales off Ulsan in 1911, while nine whales were observed in the East China Sea side of the peninsula in 1999.


title: Sperm whale

text: Grown males are known to enter surprisingly shallow bays to rest (whales will be in a state of rest during these occasions). There are unique, coastal groups reported from various areas among the globe such as near the Scotland's coastal waters, and Shiretoko Peninsula, off Kaikoura, in the Davao Gulf. Such coastal groups were more abundant in pre-whaling days.


title: Sperm whale

text: Genetic analysis indicates that the world population of sperm whales originated in the Pacific Ocean from a population of about 10,000 animals around 100,000 years ago, when expanding ice caps blocked off their access to other seas. In particular, colonization of the Atlantic was revealed to have occurred multiple times during this expansion of their range.


title: Sperm whale

text: Sperm whales usually dive between , and sometimes , in search of food. Such dives can last more than an hour. They feed on several species, notably the giant squid, but also the colossal squid, octopuses, and fish such as demersal rays and sharks, but their diet is mainly medium-sized squid. Some prey may be taken accidentally while eating other items. Most of what is known about deep-sea squid has been learned from specimens in captured sperm whale stomachs, although more recent studies analysed faeces. One study, carried out around the Galápagos, found that squid from the genera "Histioteuthis" (62%), "Ancistrocheirus" (16%), and "Octopoteuthis" (7%) weighing between were the most commonly taken. Battles between sperm whales and giant squid or colossal squid have never been observed by humans; however, white scars are believed to be caused by the large squid. One study published in 2010 collected evidence that suggests that female sperm whales may collaborate when hunting Humboldt squid. Tagging studies have shown that sperm whales hunt upside down at the bottom of their deep dives. It is suggested that the whales can see the squid silhouetted above them against the dim surface light.


title: Sperm whale

text: An older study, examining whales captured by the New Zealand whaling fleet in the Cook Strait region, found a 1.69:1 ratio of squid to fish by weight. Sperm whales sometimes take sablefish and toothfish from long lines. Long-line fishing operations in the Gulf of Alaska complain that sperm whales take advantage of their fishing operations to eat desirable species straight off the line, sparing the whales the need to hunt. However, the amount of fish taken is very little compared to what the sperm whale needs per day. Video footage has been captured of a large male sperm whale "bouncing" a long line, to gain the fish. Sperm whales are believed to prey on the megamouth shark, a rare and large deep-sea species discovered in the 1970s. In one case, three sperm whales were observed attacking or playing with a megamouth.


title: Sperm whale

text: Sperm whales have also been noted to feed on bioluminescent pyrosomes such as "Pyrosoma atlanticum". It is thought that the foraging strategy of sperm whales for bioluminescent squids may also explain the presence of these light-emitting pyrosomes in the diet of the sperm whale.


title: Sperm whale

text: The sharp beak of a consumed squid lodged in the whale's intestine may lead to the production of ambergris, analogous to the production of pearls in oysters. The irritation of the intestines caused by squid beaks stimulates the secretion of this lubricant-like substance. Sperm whales are prodigious feeders and eat around 3% of their body weight per day. The total annual consumption of prey by sperm whales worldwide is estimated to be about . In comparison, human consumption of seafood is estimated to be .


title: Sperm whale

text: Sperm whales hunt through echolocation. Their clicks are among the most powerful sounds in the animal kingdom (see above). It has been hypothesised that it can stun prey with its clicks. Experimental studies attempting to duplicate this effect have been unable to replicate the supposed injuries, casting doubt on this idea. One study showing that sound pressure levels on the squid are more than an order of magnitude below levels required for debilitation, and therefore, precluding acoustic


title: Sperm whale

text: It has been stated that sperm whales, as well as other large cetaceans, help fertilise the surface of the ocean by consuming nutrients in the depths and transporting those nutrients to the oceans' surface when they defecate, an effect known as the whale pump. This fertilises phytoplankton and other plants on the surface of the ocean and contributes to ocean productivity and the drawdown of atmospheric carbon.


title: Sperm whale

text: Sperm whales can live 70 years or more. They are a prime example of a species that has been K-selected, meaning their reproductive strategy is associated with stable environmental conditions and comprises a low birth rate, significant parental aid to offspring, slow maturation, and high longevity.


title: Sperm whale

text: How they choose mates has not been definitively determined. Bulls will fight with each other over females, and males will mate with multiple females, making them polygynous, but they do not dominate the group as in a harem. Bulls do not provide paternal care to their offspring but rather play a fatherly role to younger bulls to show dominance.


title: Sperm whale

text: Females become fertile at around 9 years of age. The oldest pregnant female ever recorded was 41 years old. Gestation requires 14 to 16 months, producing a single calf. Sexually mature females give birth once every 4 to 20 years (pregnancy rates were higher during the whaling era). Birth is a social event, as the mother and calf need others to protect them from predators. The other adults may jostle and bite the newborn in its first hours.


title: Sperm whale

text: Lactation proceeds for 19 to 42 months, but calves, rarely, may suckle up to 13 years. Like that of other whales, the sperm whale's milk has a higher fat content than that of terrestrial mammals: about 36%, compared to 4% in cow milk. This gives it a consistency similar to cottage cheese, which prevents it from dissolving in the water before the calf can drink it. It has an energy content of roughly 3,840 kcal/kg, compared to just 640 kcal/kg in cow milk. Calves may be allowed to suckle from females other than their mothers.


title: Sperm whale

text: Males become sexually mature at 18 years. Upon reaching sexual maturity, males move to higher latitudes, where the water is colder and feeding is more productive. Females remain at lower latitudes. Males reach their full size at about age 50.


title: Sperm whale

text: Like elephants, females and their young live in matriarchal groups called pods, while bulls live apart. Bulls sometimes form loose bachelor groups with other males of similar age and size. As they grow older, they typically live solitary lives, only returning to the pod to socialize or to breed . Bulls have beached themselves together, suggesting a degree of cooperation which is not yet fully understood. The whales rarely, if ever, leave their group.


title: Sperm whale

text: A "social unit" is a group of sperm whales who live and travel together over a period of years. Individuals rarely, if ever, join or leave a social unit. There is a huge variance in the size of social units. They are most commonly between six and nine individuals in size but can have more than twenty. Unlike orcas, sperm whales within a social unit show no significant tendency to associate with their genetic relatives. Females and calves spend about three-quarters of their time foraging and a quarter of their time socializing. Socializing usually takes place in the afternoon.


title: Sperm whale

text: When sperm whales socialize, they emit complex patterns of clicks called codas. They will spend much of the time rubbing against each other. Tracking of diving whales suggests that groups engage in herding of prey, similar to bait balls created by other species, though the research needs to be confirmed by tracking the prey.


title: Sperm whale

text: The most common natural predator of sperm whales is the orca (killer whale), but pilot whales and false killer whales sometimes harass them. Orcas prey on target groups of females with young, usually making an effort to extract and kill a calf. The females will protect their calves or an injured adult by encircling them. They may face inwards with their tails out (the 'marguerite formation', named after the flower). The heavy and powerful tail of an adult whale is potentially capable of delivering lethal blows. Alternatively, they may face outwards (the 'heads-out formation'). Other than sperm whales, southern right whales had been observed to perform similar formations. However, formations in non-dangerous situations have been recorded as well. Early whalers exploited this behaviour, attracting a whole unit by injuring one of its members. Such a tactic is described in "Moby-Dick": "Say you strike a Forty-barrel-bull—poor devil! all his comrades quit him. But strike a member of the harem school, and her companions swim around her with every token of concern, sometimes lingering so near her and so long, as themselves to fall a prey."If the killer whale pod is large, its members may sometimes be able to kill adult female sperm whales and can at least injure an entire pod of sperm whales. Bulls have no predators, and are believed to be too large, powerful and aggressive to be threatened by killer whales. Solitary bulls are known to interfere and come to the aid of vulnerable groups nearby. However, the bull sperm whale, when accompanying pods of female sperm whales and their calves as such, may be reportedly unable to effectively dissuade killer whales from their attacks on the group, although the killer whales may end the attack sooner when a bull is present. However, male sperm whales have been observed to attack and intimidate killer whale pods in competitive feeding instances. An incident was filmed from a long-line trawler: a killer whale pod was systematically taking fish caught on the trawler's long lines (as the lines were being pulled into the ship) when a male sperm whale appeared to repeatedly charge the killer whale pod in an attempt to drive them away; it was speculated by the film crew that the sperm whale was attempting to access the same fish. The killer whales employed a tail outward and tail-slapping defensive position against the bull sperm whale similar to that used by female sperm whales against attacking killer whales. However, at some potential feeding sites, the killer whales may prevail over sperm whales even when outnumbered by the sperm whales. Some authors consider the killer whales "usually" behaviorally dominant over sperm whales but express that the two species are "fairly evenly matched", with the killer whales' greater aggression, more considerable biting force for their size and predatory prowess more than compensating for their smaller size.


title: Sperm whale

text: Sperm whales are not known for forging bonds with other species, but it was observed that a bottlenose dolphin with a spinal deformity had been accepted into a pod of sperm whales. They are known to swim alongside other cetaceans such as humpback, fin, minke, pilot, and killer whales on occasion.


title: Sperm whale

text: Out of 35 sperm whales caught during the 1976–1977 Antarctic whaling season, all of them were infected by "Anisakis physeteris" (in their stomachs) and "Phyllobothrium delphini" (in their blubber).


title: Sperm whale

text: Both whales with a placenta were infected with "Placentonema gigantissima", potentially the largest nematode worm ever described.


title: Sperm whale

text: Although the fossil record is poor, several extinct genera have been assigned to the clade Physeteroidea, which includes the last common ancestor of the modern sperm whale, pygmy sperm whales, dwarf sperm whales, and extinct physeteroids. These fossils include "Ferecetotherium", "Idiorophus", "Diaphorocetus", "Aulophyseter", "Orycterocetus", "Scaldicetus", "Placoziphius", "Zygophyseter" and "Acrophyseter". "Ferecetotherium", found in Azerbaijan and dated to the late Oligocene (about ), is the most primitive fossil that has been found, which possesses sperm whale-specific features, such as an asymmetric rostrum ("beak" or "snout"). Most sperm whale fossils date from the Miocene period, . "Diaphorocetus", from Argentina, has been dated to the early Miocene. Fossil sperm whales from the Middle Miocene include "Aulophyseter", "Idiorophus" and "Orycterocetus", all of which were found on the West Coast of the United States, and "Scaldicetus", found in Europe and Japan. "Orycterocetus" fossils have also been found in the North Atlantic Ocean and the Mediterranean Sea, in addition to the west coast of the United States. "Placoziphius", found in Europe, and "Acrophyseter", from Peru, are dated to the late Miocene.


title: Sperm whale

text: Fossil sperm whales differ from modern sperm whales in tooth count and the shape of the face and jaws. For example, "Scaldicetus" had a tapered rostrum. Genera from the Oligocene and early and middle Miocene, with the possible exception of "Aulophyseter", had teeth in their upper jaws. "Acrophyseter", from the late Miocene, also had teeth in both the upper and lower jaws as well as a short rostrum and an upward curving mandible (lower jaw). These anatomical differences suggest that fossil species may not have necessarily been deep-sea squid eaters such as the modern sperm whale, but that some genera mainly ate fish. "Zygophyseter", dated from the middle to late Miocene and found in southern Italy, had teeth in both jaws and appears to have been adapted to feed on large prey, rather like the modern killer whale (orca). Other fossil sperm whales with adaptations similar to this are collectively known as killer sperm whales.


title: Sperm whale

text: Two poorly known fossil species belonging to the modern genus "Physeter" have been recognized so far: "P. antiquus" (Neogene of France) and "P. vetus" (Neogene of eastern North America). "Physeter vetus" is very likely an invalid species, as the few teeth that were used to identify this species appear to be identical to those of another toothed whale, "Orycterocetus quadratidens".


title: Sperm whale

text: The traditional view has been that Mysticeti (baleen whales) and Odontoceti (toothed whales) arose from more primitive whales early in the Oligocene period, and that the super-family Physeteroidea, which contains the sperm whale, dwarf sperm whale, and pygmy sperm whale, diverged from other toothed whales soon after that, over . From 1993 to 1996, molecular phylogenetics analyses by Milinkovitch and colleagues, based on comparing the genes of various modern whales, suggested that the sperm whales are more closely related to the baleen whales than they are to other toothed whales, which would have meant that Odontoceti were not monophyletic; in other words, it did not consist of a single ancestral toothed whale species and all its descendants. However, more recent studies, based on various combinations of comparative anatomy and molecular phylogenetics, criticised Milinkovitch's analysis on technical grounds and reaffirmed that the Odontoceti are monophyletic.


title: Sperm whale

text: These analyses also confirm that there was a rapid evolutionary radiation (diversification) of the Physeteroidea in the Miocene period. The Kogiidae (dwarf and pygmy sperm whales) diverged from the Physeteridae (true sperm whales) at least .


title: Sperm whale

text: Spermaceti, obtained primarily from the spermaceti organ, and sperm oil, obtained primarily from the blubber in the body, were much sought after by 18th, 19th, and 20th century whalers. These substances found a variety of commercial applications, such as candles, soap, cosmetics, machine oil, other specialised lubricants, lamp oil, pencils, crayons, leather waterproofing, rust-proofing materials and many pharmaceutical compounds. Ambergris, a highly expensive, solid, waxy, flammable substance produced in the digestive system of sperm whales, was also sought as a fixative in perfumery.


title: Sperm whale

text: Prior to the early eighteenth century, hunting was mostly by indigenous Indonesians. Legend has it that sometime in the early 18th century, around 1712, Captain Christopher Hussey, while cruising for right whales near shore, was blown offshore by a northerly wind, where he encountered a sperm whale pod and killed one. Although the story may not be true, sperm whales were indeed soon exploited by American whalers. Judge Paul Dudley, in his "Essay upon the Natural History of Whales" (1725), states that a certain Atkins, 10 or 12 years in the trade, was among the first to catch sperm whales sometime around 1720 off the New England coast.


title: Sperm whale

text: There were only a few recorded instances during the first few decades (1709–1730s) of offshore sperm whaling. Instead, sloops concentrated on the Nantucket Shoals, where they would have taken right whales or went to the Davis Strait region to catch bowhead whales. By the early 1740s, with the advent of spermaceti candles (before 1743), American vessels began to focus on sperm whales. The diary of Benjamin Bangs (1721–1769) shows that, along with the bumpkin sloop he sailed, he found three other sloops flensing sperm whales off the coast of North Carolina in late May 1743. On returning to Nantucket in the summer 1744 on a subsequent voyage, he noted that "45 spermacetes are brought in here this day," another indication that American sperm whaling was in full swing.


title: Sperm whale

text: American sperm whaling soon spread from the east coast of the American colonies to the Gulf Stream, the Grand Banks, West Africa (1763), the Azores (1765), and the South Atlantic (1770s). From 1770 to 1775 Massachusetts, New York, Connecticut, and Rhode Island ports produced 45,000 barrels of sperm oil annually, compared to 8,500 of whale oil. In the same decade, the British began sperm whaling, employing American ships and personnel. By the following decade, the French had entered the trade, also employing American expertise. Sperm whaling increased until the mid-nineteenth century. Spermaceti oil was important in public lighting (for example, in lighthouses, where it was used in the United States until 1862, when it was replaced by lard oil, in turn replaced by petroleum) and for lubricating the machines (such as those used in cotton mills) of the Industrial Revolution. Sperm whaling declined in the second half of the nineteenth century, as petroleum came into broader use. In that sense, petroleum use may be said to have protected whale populations from even greater exploitation. Sperm whaling in the 18th century began with small sloops carrying only one or two whaleboats. The fleet's scope and size increased over time, and larger ships entered the fishery. In the late 18th century and early 19th century, sperm whaling ships sailed to the equatorial Pacific, the Indian Ocean, Japan, the coast of Arabia, Australia and New Zealand. Hunting could be dangerous to the crew, since sperm whales (especially bulls) will readily fight to defend themselves against attack, unlike most baleen whales. When dealing with a threat, sperm whales will use their huge head effectively as a battering ram. Arguably the most famous sperm whale counter-attack occurred on 20 November 1820, when a whale claimed to be about long rammed and sank the Nantucket whaleship "Essex". Only 8 out of 21 sailors survived to be rescued by other ships.


title: Sperm whale

text: The sperm whale's ivory-like teeth were often sought by 18th- and 19th-century whalers, who used them to produce inked carvings known as "scrimshaw." 30 teeth of the sperm whale can be used for ivory. Each of these teeth, up to and across, are hollow for the first half of their length. Like walrus ivory, sperm whale ivory has two distinct layers. However, sperm whale ivory contains a much thicker inner layer. Though a widely practised art in the 19th century, scrimshaw using genuine sperm whale ivory declined substantially after the retirement of the whaling fleets in the 1880s.


title: Sperm whale

text: Modern whaling was more efficient than open-boat whaling, employing steam-powered ships and exploding harpoons. Initially, modern whaling activity focused on large baleen whales, but as these populations were taken, sperm whaling increased. Spermaceti, the fine waxy oil produced by sperm whales, was in high demand. In both the 1941–1942 and 1942–1943 seasons, Norwegian expeditions took over 3,000 sperm whales off the coast of Peru alone. After World War II, whaling continued unabated to obtain oil for cosmetics and high-performance machinery, such as automobile transmissions.


title: Sperm whale

text: The hunting led to the near-extinction of large whales, including sperm whales, until bans on whale oil use were instituted in 1972. The International Whaling Commission gave the species full protection in 1985, but hunting by Japan in the northern Pacific Ocean continued until 1988.


title: Sperm whale

text: It is estimated that the historic worldwide population numbered 1,100,000 before commercial sperm whaling began in the early 18th century. By 1880, it had declined by an estimated 29 percent. From that date until 1946, the population appears to have partially recovered as whaling activity decreased, but after the Second World War, the population declined even further, to 33 per cent of the pre-whaling population. Between 184,000 and 236,000 sperm whales were killed by the various whaling nations in the 19th century, while in the 20th century, at least 770,000 were taken, the majority between 1946 and 1980.


title: Sperm whale

text: Sperm whales increase levels of primary production and carbon export by depositing iron-rich faeces into surface waters of the Southern Ocean. The iron-rich faeces cause phytoplankton to grow and take up more carbon from the atmosphere. When the phytoplankton dies, it sinks to the deep ocean and takes the atmospheric carbon with it. By reducing the abundance of sperm whales in the Southern Ocean, whaling has resulted in an extra 2 million tonnes of carbon remaining in the atmosphere each year.


title: Sperm whale

text: Remaining sperm whale populations are large enough that the species' conservation status is rated as vulnerable rather than endangered. However, the recovery from centuries of commercial whaling is a slow process, particularly in the South Pacific, where the toll on breeding-age males was severe.


title: Sperm whale

text: The total number of sperm whales in the world is unknown, but is thought to be in the hundreds of thousands. The conservation outlook is brighter than for many other whales. Commercial whaling has ceased, and the species is protected almost worldwide, though records indicate that in the 11-year period starting from 2000, Japanese vessels have caught 51 sperm whales. Fishermen do not target the creatures sperm whales eat, but long-line fishing operations in the Gulf of Alaska have complained about sperm whales stealing fish from their lines.


title: Sperm whale

text: Currently, entanglement in fishing nets and collisions with ships represent the greatest threats to the sperm whale population. Other threats include ingestion of marine debris, ocean noise, and chemical pollution. The International Union for Conservation of Nature (IUCN) regards the sperm whale as being "vulnerable". The species is listed as endangered on the United States Endangered Species Act.


title: Sperm whale

text: Sperm whales are listed on Appendix I and Appendix II of the Convention on the Conservation of Migratory Species of Wild Animals (CMS). It is listed on Appendix I as this species has been categorized as being in danger of extinction throughout all or a significant proportion of their range and CMS Parties strive towards strictly protecting these animals, conserving or restoring the places where they live, mitigating obstacles to migration and controlling other factors that might endanger them. It is listed on Appendix II as it has an unfavourable conservation status or would benefit significantly from international co-operation organised by tailored agreements. It is also covered by the Agreement on the Conservation of Cetaceans in the Black Sea, Mediterranean Sea and Contiguous Atlantic Area (ACCOBAMS) and the Memorandum of Understanding for the Conservation of Cetaceans and Their Habitats in the Pacific Islands Region (Pacific Cetaceans MOU).


title: Sperm whale

text: The species is protected under Appendix I of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). This makes commercial international trade (including in parts and derivatives) prohibited, with all other international trade strictly regulated through a system of permits and certificates.


title: Sperm whale

text: Rope-mounted teeth are important cultural objects throughout the Pacific. In New Zealand, the Māori know them as "rei puta"; such whale tooth pendants were rare objects because sperm whales were not actively hunted in traditional Māori society. Whale ivory and bone were taken from beached whales. In Fiji the teeth are known as "tabua", traditionally given as gifts for atonement or esteem (called "sevusevu"), and were important in negotiations between rival chiefs. Friedrich Ratzel in "The History of Mankind" reported in 1896 that, in Fiji, whales' or cachalots' teeth were the most-demanded article of ornament or value. They occurred often in necklaces. Today the tabua remains an important item in Fijian life. The teeth were originally rare in Fiji and Tonga, which exported teeth, but with the Europeans' arrival, teeth flooded the market and this "currency" collapsed. The oversupply led in turn to the development of the European art of scrimshaw.


title: Sperm whale

text: Herman Melville's novel "Moby-Dick" is based on a true story about a sperm whale that attacked and sank the whaleship "Essex". Melville associated the sperm whale with the Bible's Leviathan. The fearsome reputation perpetuated by Melville was based on bull whales' ability to fiercely defend themselves from attacks by early whalers, smashing whaling boats and, occasionally, attacking and destroying whaling ships.


title: Sperm whale

text: In Jules Verne's "Twenty Thousand Leagues Under the Sea", the Nautilus fights a group of "cachalots" (sperm whales) to protect a pod of southern right whales from their attacks. Verne portrays them as being savage hunters ("nothing but mouth and teeth").


title: Sperm whale

text: The sperm whale was designated as the Connecticut state animal by the General Assembly in 1975. It was selected because of its specific contribution to the state's history and because of its present-day plight as an endangered species.


title: Sperm whale

text: Sperm whales are not the easiest of whales to watch, due to their long dive times and ability to travel long distances underwater. However, due to the distinctive look and large size of the whale, watching is increasingly popular. Sperm whale watchers often use hydrophones to listen to the clicks of the whales and locate them before they surface. Popular locations for sperm whale watching include the town of Kaikoura on New Zealand's South Island, Andenes and Tromsø in Arctic Norway; as well as the Azores, where the continental shelf is so narrow that whales can be observed from the shore, and Dominica where a long-term scientific research program, The Dominica Sperm Whale Project, has been in operation since 2005.


title: Sperm whale

text: The introduction of plastic waste to the ocean environment by humans is relatively new. From the 1970s, sperm whales have occasionally been found with pieces of plastic in their stomachs.


title: Harry Potter and the Chamber of Secrets (film)

text: Harry Potter and the Chamber of Secrets is a 2002 fantasy film directed by Chris Columbus and distributed by Warner Bros. Pictures, based on J. K. Rowling's 1998 novel of the same name. The film, which is the second instalment in the "Harry Potter" film series, was written by Steve Kloves, and produced by David Heyman. The film stars Daniel Radcliffe as Harry Potter, with Rupert Grint and Emma Watson as his best friends Ron Weasley and Hermione Granger respectively. The story follows Harry's second year at Hogwarts School of Witchcraft and Wizardry, where the Heir of Salazar Slytherin opens the Chamber of Secrets, unleashing a monster that petrifies the school's students. The film is the sequel to "Harry Potter and the Philosopher’s Stone" (2001).


text: Principal photography began in November 2001, only three days after the release of the first film. The filming concluded in July 2002, and the film had a budget of $100 million. "Harry Potter and the Chamber of Secrets" premiered in London on 3 November 2002, and was released theatrically in the United Kingdom and the United States on 15 November 2002.


text: The film became a critical and commercial success, grossing $879 million worldwide and becoming the second-highest-grossing film of 2002, behind "". It was praised for its darker plot, sets and a story appropriate for a young audience. This film has the longest runtime in the series. It was nominated for many awards, including the BAFTA Award for Best Production Design, Best Sound, and Best Special Visual Effects. It was followed by "Harry Potter and the Prisoner of Azkaban" (2004).


text: Spending the summer with the Dursleys, Harry Potter meets Dobby, a house-elf who warns him that it is dangerous to return to Hogwarts. Dobby sabotages an important dinner for the Dursleys, who lock up Harry to prevent his return to Hogwarts. Harry's friend Ron Weasley and his brothers Fred and George rescue him in their father's flying car.


text: In Diagon Alley, Harry, the Weasleys and Hermione Granger notice a book-signing by Gilderoy Lockhart, Hogwarts' new Defence Against the Dark Arts teacher. There, Harry sees Draco Malfoy's father, Lucius, slip a book into Ginny Weasley's cauldron. After being blocked from entering Platform Nine and Three-Quarters at King's Cross railway station, Harry and Ron take the car to Hogwarts. There, they crash into the Whomping Willow, breaking Ron's wand, and receive detention.


text: In detention, Harry hears a strange voice and later finds caretaker Argus Filch's cat, Mrs Norris, petrified beside a message written in blood: "The Chamber of Secrets has been opened, enemies of the heir... beware." One of Hogwarts' founders, Salazar Slytherin, supposedly constructed a secret Chamber containing a monster that only his heir can control, capable of purging the school of Muggle-born students. To solve this mistery, Harry, Ron, and Hermione plan to question Malfoy, using polyjuice potion, which they brew in a bathroom haunted by Moaning Myrtle, a ghost.


text: During a Quidditch game, Harry's arm is broken by a rogue Bludger. Dobby visits him in the infirmary and reveals that he closed the barrier to Platform Nine and Three-Quarters and made the Bludger chase Harry to force him to leave the school. He also reveals that the Chamber had been opened in the past. When Harry communicates with a snake, the school believes he is the heir. Disguised as two of Malfoy’s friends, Harry and Ron learn he is not the heir, but come to know that a Muggle-born girl died when the Chamber was last opened. Harry finds an enchanted diary owned by former student Tom Riddle, who opened the Chamber and blamed Rubeus Hagrid, leading to his expulsion. When the diary is stolen and Hermione is petrified, Harry and Ron question Hagrid. Professor Dumbledore, Minister of Magic Cornelius Fudge, and Lucius arrive to take Hagrid to Azkaban, but he discreetly tells the boys to "follow the spiders". In the Forbidden Forest, Harry and Ron meet Hagrid's giant pet spider, Aragog, who reveals Hagrid's innocence.


text: A book page in Hermione's hand identifies the monster as a basilisk, a giant serpent that kills people who make direct eye contact with it; the petrified victims only saw it indirectly. The school staff learns Ginny has been taken into the Chamber, and nominate Lockhart to save her. Harry and Ron find Lockhart preparing to flee, exposing him as a fraud. Deducing that Myrtle was the Muggle-born girl that the basilisk killed, they find the Chamber's entrance in the bathroom she haunts. Once inside, Lockhart tries to stop Harry and Ron by using a memory charm. However, because he seized Ron's broken wand, the spell backfires, erasing Lockhart's memory and causing a cave-in that separates Harry from Ron and Lockhart.


text: Harry enters the Chamber alone and finds Ginny unconscious, guarded by Riddle. Riddle turns out to be Slytherin's heir and Voldemort's younger self. He used the diary to manipulate Ginny into reopening the Chamber. After Harry expresses his loyalty to Dumbledore, the latter's pet phoenix Fawkes arrives with the Sorting Hat, causing Riddle to summon the basilisk. Fawkes blinds the basilisk, and the Sorting Hat produces the Sword of Gryffindor, with which Harry battles the basilisk. After a struggle, he kills it but is poisoned by one of its fangs.


text: Despite his injury, Harry stabs the diary with the basilisk fang, destroying Riddle and reviving Ginny. Fawkes' tears heal Harry, who returns to Hogwarts with his friends and a baffled Lockhart, earning Dumbledore's praise and Hagrid's release. Harry accuses Lucius, Dobby's master, of planting the diary in Ginny's cauldron, and tricks him into freeing Dobby. The basilisk's victims are healed, Hermione reunites with Harry and Ron, and Hagrid is released from Azkaban.


text: Several actors from "Philosopher's Stone" reprise their roles in this film. Harry Melling portrays Dudley Dursley, Harry's cousin. James and Oliver Phelps play Fred and George Weasley, Ron's twin brothers; Chris Rankin appears as Percy Weasley, Ron's other brother and a Gryffindor prefect; and Bonnie Wright portrays their sister Ginny. Tom Felton plays Draco Malfoy, Harry's rival in Slytherin, while Jamie Waylett and Joshua Herdman appear as Crabbe and Goyle, Draco's minions. Matthew Lewis, Devon Murray and Alfred Enoch play Neville Longbottom, Seamus Finnigan and Dean Thomas, respectively, three Gryffindor students in Harry's year. David Bradley portrays Argus Filch, Hogwarts' caretaker, and Sean Biggerstaff as Oliver Wood, the Keeper of the Gryffindor Quidditch team. Leslie Phillips voices the Sorting Hat.


text: Christian Coulson appears as Tom Marvolo Riddle, a manifestation of young Lord Voldemort; before Coulson was cast, Eddie Redmayne –who later played Newt Scamander in the "Fantastic Beasts" films– auditioned for the role. Mark Williams portrays Arthur Weasley, Ron's father. Shirley Henderson plays Moaning Myrtle, a Hogwarts ghost. Miriam Margolyes appears as Pomona Sprout, Hogwarts' Herbology professor and head of Hufflepuff. Hugh Mitchell portrays Colin Creevey, a first year student that is a fan of Harry's. Robert Hardy appears as Cornelius Fudge, the Minister for Magic. Toby Jones voices Dobby, a House-elf, while Julian Glover voices Aragog, an acromantula.


text: Production designer Stuart Craig returned for the sequel to design new elements previously not seen in the first film. He designed the Burrow based on Arthur Weasley's interest in Muggles, built vertically out of architectural salvage. Mr. Weasley's flying car was created from a 1962 Ford Anglia 105E. The Chamber of Secrets, measuring over long and wide, was the biggest set created for the saga. Dumbledore's office, which houses the Sorting Hat and the Sword of Gryffindor, was also built for the film.


text: Lindy Hemming was the costume designer for "Chamber of Secrets". She retained many of the characters' already established appearances, and chose to focus on the new characters introduced in the sequel. Gilderoy Lockhart's wardrobe incorporated bright colours, in contrast with the "dark, muted or sombre colours" of the other characters. Branagh said, "We wanted to create a hybrid between a period dandy and someone who looked as if they could fit into Hogwarts." Hemming also perfected Lucius Malfoy's costume. One of the original concepts was for him to wear a pinstripe suit, but was changed to furs and a snake head cane in order to remark his aristocrat quality and to reflect a "sense of the old."


text: Principal photography began on 19 November 2001, only three days after the wide release of the first film. Second-unit work had started three weeks before, primarily for the flying car scene. Filming took place mainly at Leavesden Film Studios in Hertfordshire, as well as on the Isle of Man. King's Cross railway station was used as the filming location for Platform 9¾, though St Pancras railway station was used for the exterior shots. Gloucester Cathedral was used as the setting for Hogwarts School, along with Durham Cathedral, Alnwick Castle, Lacock Abbey, and the Bodleian Library at the University of Oxford. The Burrow was built in Gypsy Lane, Abbots Langley, in front of Leavesden Studios.


text: Roger Pratt was brought on as director of photography for "Chamber of Secrets", in order to give the film "a darker and edgier feel" than its predecessor, which reflected "the growth of the characters and the story." Director Chris Columbus opted to use handheld cameras to allow more freedom in movement, which he considered "a departure for [him] as a filmmaker." University of Cambridge linguistics professor Francis Nolan created Parseltongue, the language spoken by snakes in the film. Principal photography wrapped in July 2002.


text: Due to the events that take place in "Harry Potter and the Chamber of Secrets", the film's sound effects were much more expansive than in the previous instalment. Sound designer and co-supervising sound editor Randy Thom returned for the sequel using Pro Tools to complete the job, which included initial conceptions done at Skywalker Sound in California and primary work done at Shepperton Studios in England.


text: Thom wanted to give the Whomping Willow a voice, a deep growl for which he used his own voice slowed down, equalised and bass-boosted. For the mandrakes, he combined baby cries with female screams, in order to "make it just exotic enough so that you think, 'Hmm, I've never heard anything quite like "that" before.'"


text: Thom described the basilisk as a challenge, "because it's a giant snake, but it's also like a dragon — not many snakes have teeth like that. He had to hiss, he had to roar and there were times at the end when he was in pain." He mixed his own voice, tiger roars, and horse and elephant vocalizations.


text: Industrial Light & Magic, Mill Film, the Moving Picture Company (MPC), Cinesite and Framestore CFC handled the approximately 950 visual effect shots in the film. Jim Mitchell and Nick Davis served as visual effects supervisors. They were in charge of creating the CG characters Dobby the House Elf, the Basilisk, and the Cornish pixies, among others. Chas Jarrett from MPC served as CG supervisor, overseeing the approach of any shot that contains CG in the film. With a crew of 70 people, the company produced 251 shots, 244 of which made it to the film, from September 2001 to October 2002.


text: The visual effects team worked alongside creature effects supervisor Nick Dudman, who devised Fawkes the Phoenix, the Mandrakes, Aragog the Acromantula, and the first of the Basilisk. According to Dudman, Aragog was the most challenging character to create. The giant spider stood tall with an foot leg span, each of which had to be controlled by a different team member. The whole creature weighed three quarters of a ton. It took over 15 people to operate the animatronic Aragog on set.


text: The Whomping Willow sequence required a combination of practical and visual effects. Special effects supervisor John Richardson and his team created mechanically operated branches to hit the flying car. A 1:3 scale set was built on stage at Shepperton Studios, which featured the fully-sized top third of the tree with a forced perspective to appear a height of over high. The courtyard and the tree were built in 3D. Some shots ended up being entirely digital. Jarret identified the rendering as "the biggest challenge" of the scene, because "there was just so much going on in [it] ... It was simply massive."


text: John Williams, who composed the previous film's score, returned to score "Harry Potter and the Chamber of Secrets". Composing the film proved to be a difficult task, as Williams had just completed scoring "" and "Minority Report" when work was to begin on "Catch Me If You Can". Because of this, William Ross was brought in to arrange themes from the "Philosopher's Stone" into the new material that Williams was composing whenever he had the chance. Ross also conducted the scoring sessions with the London Symphony Orchestra. The soundtrack album was released on 12 November 2002.


text: Footage for the film began appearing online in the summer of 2002, with a teaser trailer debuting in cinemas with the release of "Scooby-Doo". A video game based on the film was released in early November 2002 by Electronic Arts for several consoles, including GameCube, PlayStation 2, and Xbox. The film also continued the merchandising success set by its predecessor, with reports of shortages on Lego's "Chamber of Secrets" tie-ins.


text: The film was originally released in the UK, US and Canada on 11 April 2003 on both VHS tape and in a two-disc special edition fullscreen/widescreen DVD digipack, which included extended and deleted scenes and interviews. On 11 December 2007, the film's Blu-ray version was released. An Ultimate Edition of the film was released on 8 December 2009, featuring new footage, TV spots, an extended version of the film with deleted scenes edited in, and a feature-length special "Creating the World of Harry Potter Part 2: Characters". The film's extended version has a running time of about 174 minutes, which has previously been shown during certain television airings.


text: "Harry Potter and the Chamber of Secrets" held its world premiere at Odeon Leicester Square on 3 November 2002, and was released in the United Kingdom and the United States on 15 November 2002. The film broke multiple records upon its opening. In the US and Canada, the film opened to an $88.4million opening weekend at 3,682 cinemas, the third-largest opening at the time, behind "Spider-Man" and its predecessor "Harry Potter and the Philosopher's Stone". The film would hold the record for having the largest number of screenings until it was surpassed by "X2" the next year. It was also No. 1 at the box office for two non-consecutive weekends. In the United Kingdom, the film broke all opening records that were previously held by "Philosopher's Stone". It made £18.9million during its opening including previews and £10.9million excluding previews.


text: Internationally, the film earned $59.5 million during its opening weekend. The film earned $3.7 million in Japan, making it the highest opening of any film in the country until it was surpassed a year later by "The Matrix Reloaded". In Malaysia, "Harry Potter and the Chamber of Secrets" made a total of $474,000, breaking "Eraser"s record for having the country's biggest opening for any Warner Bros. film. It would go on to generate a total of $1.03 million in Singapore, becoming the second-highest film opening in the country, after "". Meanwhile, the film earned $3.1 million in Taiwan, surpassing "The Mummy Returns" by 16%. "Harry Potter and the Chamber of Secrets" would then gross over $1.15 million in the Philippines, ranking as an industry high in the country only 5% bigger than "Godzilla". The film made a total of $879.8million worldwide. It was the second-highest-grossing film of 2002 worldwide behind "", and the fourth highest-grossing film in the US and Canada that year with $262.6 million behind "Spider-Man", "The Two Towers", and "". However, it was the year's number one film outside of America, making $617.2million compared to "The Two Towers" $584.5million.


text: On Rotten Tomatoes the film has an approval rating of based on reviews, with an average rating of . The site's critical consensus reads, "Though perhaps more enchanting for younger audiences, "Chamber of Secrets" is nevertheless both darker and livelier than its predecessor, expanding and improving upon the first film's universe." On Metacritic the film has a weighted average score of 63 out of 100, based on 35 critics, indicating "generally favorable reviews". Audiences polled by CinemaScore gave the film a rare "A+", the only film in the "Harry Potter" series to receive such grade.


text: Roger Ebert gave "The Chamber of Secrets" 4 out of 4 stars, especially praising the set design. "Entertainment Weekly" commended the film for being better and darker than its predecessor: "And among the things this "Harry Potter" does very well indeed is deepen the darker, more frightening atmosphere for audiences. This is as it should be: Harry's story is supposed to get darker". Richard Roeper praised Columbus' direction and the film's faithfulness to the book, saying: "Chris Columbus, the director, does a real wonderful job of being faithful to the story but also taking it into a cinematic era". "Variety" said the film was excessively long, but praised it for being darker and more dramatic, saying that its confidence and intermittent flair to give it a life of its own apart from the books was something "The Philosopher's Stone" never achieved. "The Guardian" praised the darker storyline, but said that the acting could have been better.


text: A. O. Scott from "The New York Times" said: "instead of feeling stirred you may feel battered and worn down, but not, in the end, too terribly disappointed". Peter Travers from "Rolling Stone" condemned the film for being over-long and too faithful to the book: "Once again, director Chris Columbus takes a hat-in-hand approach to Rowling that stifles creativity and allows the film to drag on for nearly three hours". Kenneth Turan from the "Los Angeles Times" called the film a cliché which is "deja vu all over again, it's likely that whatever you thought of the first production – pro or con – you'll likely think of this one".


text: "Chamber of Secrets" was nominated for three BAFTA Awards: Best Production Design, Best Sound, and Best Special Visual Effects. The film was also nominated for six Saturn Awards. It received two nominations at the inaugural Visual Effects Society Awards. The Broadcast Film Critics Association granted it the Best Family Film and Best Composer awards, and nominated it for Best Digital Acting Performance (for Toby Jones).


title: Beagle

text: The beagle is a breed of small scent hound, similar in appearance to the much larger foxhound. The beagle was developed primarily for hunting hare known as beagling. Possessing a great sense of smell and superior tracking instincts, the beagle is the primary breed used as a detection dog for prohibited agricultural imports and foodstuffs in quarantine around the world. The beagle is intelligent and is a popular pet due to its size, good temper, and a lack of inherited health problems.


title: Beagle

text: The modern breed was developed in Great Britain around the 1830s from several breeds, including the Talbot Hound, the North Country Beagle, the Southern Hound, and possibly the Harrier.


title: Beagle

text: Beagles have been depicted in popular culture since Elizabethan times in literature and paintings and more recently in film, television, and comic books.


title: Beagle

text: The origin of the beagle is not known. In the 11th century, William the Conqueror brought the St. Hubert Hound and the Talbot hound to Britain. In Britain, both of these strains were then crossed with Greyhounds to give them speed and stamina for deer hunting. Beagles are similar to the Harrier and the extinct Southern Hound, though they are smaller and slower.


title: Beagle

text: From medieval times, "beagle" was used as a generic description for the smaller hounds, though these dogs differed considerably from the modern breed. Miniature breeds of beagle-type dogs were known from the times of Edward II and Henry VII, who both had packs of Glove Beagles, so named since they were small enough to fit on a glove, and Queen Elizabeth I kept a breed known as a Pocket Beagle, which stood at the shoulder. Small enough to fit in a "pocket" or saddlebag, they rode along on the hunt. The larger hounds would run the prey to ground, then the hunters would release the small dogs to continue the chase through underbrush. Elizabeth I referred to the dogs as her "singing beagles" and often entertained guests at her royal table by letting her Pocket Beagles cavort amid their plates and cups. 19th-century sources refer to these breeds interchangeably and it is possible that the two names refer to the same small variety. In George Jesse's "Researches into the History of the British Dog" from 1866, the early 17th-century poet and writer Gervase Markham is quoted referring to the beagle as small enough to sit on a man's hand and to the:


title: Beagle

text: By the 18th century, two breeds had been developed for hunting hare and rabbit: the Southern Hound and the North Country Beagle (or Northern Hound). The Southern Hound, a tall, heavy dog with a square head, and long, soft ears, was common from south of the River Trent and probably closely related to the Talbot Hound. Though slow, it had stamina and an excellent scenting ability. The North Country Beagle, possibly a cross between an offshoot of the Talbot stock and a Greyhound, was bred chiefly in Yorkshire and was common in the northern counties. It was smaller than the Southern Hound, less heavy-set, and with a more pointed muzzle. It was faster than its southern counterpart but its scenting abilities were less well-developed.


title: Beagle

text: Standards for the Pocket Beagle were drawn up as late as 1901; these genetic lines are now extinct, although modern breeders have attempted to recreate the variety.