Inia (Inia geoffrensis), a toothed fresh-water Cetacean, not unlike a dolphin, but with certain anatomical peculiarities which keep it outside that family. It is found in some of the upper tributaries of the Amazons, and in the lakes near the Cordilleras. It measures about 8 feet in length, has a long cylindrical snout with stiff hairs, and a very slight dorsal fin. It feeds chiefly on fish, and is hunted for the sake of the oil which it yields. It is generally found in little troops of three or four. The females show great affection for their young.