GRAMPUS (Orcinus orca), a cetacean belonging to the Delphinidae or dolphin family, characterized by its rounded head without distinct beak, high dorsal fin and large conical teeth. The upper parts are nearly uniform glossy black, with a white eye stripe and the under parts white. The animal is also known as the "killer," in allusion to its ferocity in attacking its prey, which consists of fishes, seals, porpoises, and the smaller dolphins. It is very voracious. In the Antarctic several will combine to break the ice in order to throw their prey (and, it is said, even men) into the water where they can kill it. These cetaceans sometimes hunt in packs and commit great havoc among the belugas (q.v.) and other whales. The grampus inhabits both northern and south ern regions, and is by no means uncommon in British waters. The number of species is doubtful, but only one is usually recog nized. Grampus is used as the generic name of Risso's dolphin. (See CETACEA.)