Miocene to Recent | image = Porpoise touching.jpg | image_width = 225px | image_caption = Phocoena phocoena, Harbour Porpoise at the Fjord & Bæltcentret in Denmark | regnum = Animalia | phylum = Chordata | classis = Mammalia | ordo = Cetacea | subordo = Odontoceti | superfamilia = Delphinoidea | familia = Phocoenidae | familia_authority = Gray, 1825 | subdivision_ranks = Genera | subdivision = See text }} Porpoises are small cetaceans of the family Phocoenidae; they're related to whales an… (More on Phocoenidae)