The killer whale is a porpoise.
The killer whale or orca ( Orcinus orca ) is a toothed whale belonging to the oceanic dolphin family , of which it is the largest member . The toothed whales ( systematic name Odontoceti ) are a parvorder of cetaceans that includes all the dolphins and porpoises , as well as the whales that have teeth , such as the beaked whales and sperm whales .