Smallest whale

Taxonomically, there is no such thing as a whale: along with dolphins and porpoises, whales are a diverse group of mammals within the infraorder Cetacea. Whales are divided into baleen whales (Mysticeti) and toothed whales (Odontoceti), and the smallest species commonly understood to be a whale is the dwarf sperm whale (Kogia sima), a toothed whale that measures up to 2.72 m (8 ft 10 in) in length and 272 kg (600 lb) in weight.

The definition of a whale is informal, commonly taken to mean the larger cetaceans, even though some species are smaller than dolphins and porpoises. There are members of the dolphin family (Delphinidae) with the word "whale" in their names – such as pilot whales and killer whales – but these are not commonly considered whales