Porpoise is a type of aquatic mammal belonging to the CETACEAN family, which includes dolphins, whales, and other marine creatures. It is also known as a DOLPHIN, seahog, or seapig. Porpoises are characterized by their small size, rounded bodies, and blunt snouts. They are found in coastal waters around the world and feed on fish, squid, and crustaceans. Porpoises are highly social animals and often travel in pods.