The Family Phocoenidae comprises the porpoises, small to medium-sized marine mammals closely related to dolphins. Porpoises are characterized by robust, compact bodies, short beaks, and spade-shaped teeth, distinguishing them from dolphins’ longer snouts and conical teeth. They inhabit coastal and offshore waters of most oceans and seas, feeding primarily on fish and squid. Generally shy and less acrobatic than dolphins, porpoises are social animals, often found in small groups. Many species in this family, such as the vaquita and the harbor porpoise, are threatened or endangered, making conservation efforts critical for their survival.