Sperm whale

The sperm whale (Physeter macrocephalus), also known as the cachalot, is the largest toothed whale species and the largest toothed predator. The sperm whale is the only living species in the genus Physeter, the family, Physeteridae, and one of the three species of the superfamily, Physeteroidea, the other two being the pygmy sperm whale and dwarf sperm whale. Sperm whales reside at the pelagic zone in a worldwide range, and will migrate seasonally for feeding and breeding. Females give birth every 4 to 20 years, and take care of their calves for more than a decade. Females and young male sperm whales would live in pods together, while mature males (bulls) live solitary, outside of mating season. Sperm whales only known natural predator is the killer whale. The sperm whale has the largest brain on Earth, which is more than five times heavier than a human brain. It is also the third deepest diving mammal, exceeded by only the southern elephant seal and Cuvier's beaked whale.