griseus: DOLPHIN V. PORPOISE, WHAT’S THE DIFFERENCE? Dolphins fall into 2 families: Delphinidae (oceanic dolphins), and Platanistoidea(river dolphins). Porpoises belong to the Phocoenidae family.Dolphins have long beaks; porpoises have blunt noses. Dolphins have conical teeth; porpoises have spade-shaped teeth. Dolphins have a fatty structure in... - http://dendroica.tumblr.com/post...