dolphin - any of various small toothed whales with a beaklike snout; larger than porpoises

genus Phocaena, Phocaena - porpoises

harbor porpoise, herring hog, Phocaena phocaena - the common porpoise of the northern Atlantic and Pacific

Phocaena sinus, vaquita - a short porpoise that lives in the Gulf of California; an endangered species