how can you tell if a great white shark is a male or female
Great white shark In great white sharks, sexual dimorphism is present, and females are generally larger than males. Male great whites on average measure 3.4 to 4.0 m (11 to 13 ft) long, while females at 4.6 to 4.9 m (15 to 16 ft).[6] Adults of this species weigh 522–771 kg (1,151–1,700 lb) on average,[30] however mature females can have an average mass of 680–1,110 kg (1,500–2,450 lb).[5] The largest females have been verified up to 6.1 m (20 ft) in length and an estimated 1,950 kg (4,300 lb) in weight,[3][4][5] perhaps up to 2,268 kg (5,000 lb).[31] The maximum size is subject to debate because some reports are rough estimations or speculations performed under questionable circumstances.[32] Among living cartilaginous fish, only the whale shark (Rhincodon typus), the basking shark (Cetorhinus maximus) and the giant manta ray (Manta birostris), in that order, average larger and heavier. These three species are generally quite docile in disposition and given to passively filter-feeding on very small organisms.[30] This makes the great white shark the largest extant macropredatory fish. Great white sharks are at around 1.2 m (3.9 ft) when born, and grow about 25 cm (9.8 in) each year.[33]
Shark attack Only a few types of sharks are dangerous to humans. Out of more than 480 shark species, only three are responsible for two-digit numbers of fatal unprovoked attacks on humans: the great white, tiger and bull;[2] however, the oceanic whitetip has probably killed many more castaways which have not been recorded in the statistics.[3] These sharks, being large, powerful predators, may sometimes attack and kill people; however, they have all been filmed in open water by unprotected divers.[26][27] The 2010 French film Oceans shows footage of humans swimming next to sharks in the ocean. It is possible that the sharks are able to sense the presence of unnatural elements on or about the divers, such as polyurethane diving suits and air tanks, which may lead them to accept temporary outsiders as more of a curiosity than prey. Uncostumed humans, however, such as those surfboarding, light snorkeling or swimming, present a much greater area of exposed skin surface to sharks. In addition, the presence of even small traces of blood, recent minor abrasions, cuts, scrapes or bruises, may lead sharks to attack a human in their environment. Sharks seek out prey through electroreception, sensing the electric fields that are generated by all animals due to the activity of their nerves and muscles.