Sperm whale

Sperm whale
A mother and baby Sperm whale
Size comparison against an average human
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Cetacea
Suborder:	Odontoceti
Family:	Physeteridae
Genus:	Physeter
Binomial name
Physeter catodon Linnaeus, 1758

The sperm whale (Physeter catodon), also known as the cachalot, is the largest toothed whale. It has the biggest head of any animal. The head can be about 20 feet (6.1 m) long, and is about one-third of the whale's body. It also has biggest brain in the entire animal kingdom.^[1] Its lower jaw is small and contains its huge, conical teeth. These teeth fit into sockets in the upper jaw.

1. ↑ "Brains". American Museum of Natural History.