Premise: Cetacea ( [ sᵻˈteɪʃə ] ) are a widely distributed and diverse clade of aquatic mammals that today consists of the whales , dolphins , and porpoises . 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 .
Hypothesis: The killer whale is a freshwater shark.
Label: CONTRADICTION