The harbor porpoise (Phocoena phocoena) is one of the smallest and most common cetaceans. Harbor porpoises weigh between 61-77kg (135-170lbs) and are usually 1.5-1.7m (5-5.5ft) long. They are found in northern temperate to sub-arctic waters most often in shallower bays or near shore. Like all porpoises, they differ from their dolphin cousins in the triangular shape of their dorsal fin, their blunt rostrum, and their spade-like, rather than conical, teeth. You can further explore the anatomy of the harbor porpoise below.