where did the sperm whale get its name
Sperm whale The name sperm whale is a truncation of spermaceti whale. Spermaceti, originally mistakenly identified as the whales' semen, is the semi-liquid, waxy substance found within the whale's head (see below).[8] 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 cachau in the Gascon dialect (a word of either Romance[9] or Basque[10] origin). The etymological dictionary of Corominas says the origin is uncertain, but it suggests that it comes from the Vulgar Latin cappula, plural of cappulum, "sword hilt".[11] The word cachalot came to English via French from Spanish or Portuguese cachalote, perhaps from Galician/Portuguese cachola, "big head".[12] The term is retained in the Russian word for the animal, кашалот (kashalot), as well as in many other languages.
Sei whale Following large-scale commercial whaling during the late 19th and 20th centuries, when over 255,000 whales were taken,[8][9] the sei whale is now internationally protected,[2] although limited hunting occurs under a controversial research program conducted by Japan.[10] As of 2008[update], its worldwide population was about 80,000, nearly a third of its prewhaling population.[11][12]