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. The sperm whale is a pelagic mammal with a worldwide range, and will migrate seasonally for feeding and breeding. The females cooperate to protect and nurse their young. Females give birth every four to 20 years, and care for the calves for more than a decade.
Whale - Wikipedia
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Whales are a widely distributed and diverse group of fully aquatic placental marine mammals. They are an informal grouping within the infraorder Cetacea , usually excluding dolphins and porpoises. Whales, dolphins and porpoises belong to the order Cetartiodactyla , which consists of even-toed ungulates. Their closest living relatives are the hippopotamuses , having diverged about 40 million years ago. The two parvorders of whales, baleen whales Mysticeti and toothed whales Odontoceti , are thought to have split apart around 34 million years ago.
The sperm whale is the largest toothed whale. Males reach 60 feet 17 m in length and the smaller females are 37 feet 12 m. They are dark gray in color, have a hump rather than a dorsal fin, and usually display their tail flukes when they dive. Their skin is wrinkled to increase surface area for heat loss, giving them a shriveled look. Their heads make up one-third of their body length and are squarish in shape.