Pontolis magnus

Pontolis magnus is the oldest named of the three species of Pontolis, an extinct genus of large walrus whose fossils come from the Pacific coast of North America, from what are now the coasts of California and Oregon, between about 11.6 and 5.3 million years ago. The skull of Pontolis is 60 centimetres long, which is longer than that of any other prehistoric pinniped and twice as big as the skulls of modern male walruses. The animal reached more than 4 metres in body length, rivalling the southern elephant seal as the largest pinniped and carnivoran of all time, and weight estimates run from 2,000 to 4,000 kilograms. Like many other extinct walruses, its upper canines did not grow into long tusks.