The false killer whale (Pseudorca crassidens) is a cetacean, and the fourth-largest member of the oceanic dolphin family (Delphinidae). It lives in temperate and tropical waters throughout the world. As its name implies, the false killer whale shares characteristics, such as appearance, with the more widely known killer whale. Like the killer whale, the false killer whale attacks and kills other cetaceans, but the two species do not belong to the same genus. The false killer whale has not been extensively studied in the wild; much of the data about it have been derived by examining stranded false killer whales. (source)