Claim: The killer whale is a porpoise.
Evidence: The killer whale or orca -LRB- Orcinus orca -RRB- is a toothed whale belonging to the oceanic dolphin family , of which it is the largest member.
The toothed whales -LRB- systematic name Odontoceti -RRB- 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.