<P> The sperm whale is a prominent user of echolocation and communication, with vocalization as loud as 230 decibels (re 1 μPa at 1 m) underwater . It has the largest brain of any animal on Earth, more than five times heavier than a human's . Sperm whales can live for more than 60 years . </P> <P> Spermaceti oil (called "sperm" for short), from which the whale derives its name, was a prime target of the whaling industry, and was dominant for use in oil lamps, lubricants, and candles . Ambergris is a solid waxy waste product from its digestive system . It is still highly valued as a fixative in perfumes and other uses . It remains as flotsam from deceased whales, and is sought by beachcombers . The species is now protected by a whaling moratorium, and is currently listed as vulnerable by the International Union for Conservation of Nature (IUCN). </P> <P> 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). 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 or Basque 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". The word cachalot came to English via French from Spanish or Portuguese cachalote, perhaps from Galician / Portuguese cachola, "big head". The term is retained in the Russian word for the animal, кашалот (kashalot), as well as in many other languages . </P> <P> The scientific genus name Physeter comes from Greek physētēr (φυσητήρ), meaning "blowpipe, blowhole (of a whale)", or--as a pars pro toto--"whale". The specific name macrocephalus is Latinized from the Greek makrokephalos (μακροκέφαλος, meaning "big - headed"), from makros (μακρός, "large") + kefalos (κέφαλος, "head"). </P>

Where did the sperm whale get its name
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