Walrus (L) – the last of the odobenidae, the mighty walrus needs no introduction. They live in the Arctic Circle, with two different populations in the Atlantic and Pacific. Their horny hide and long tusks make them fearsome opponents, and they can kill attacking polar bears. They love to eat bivalves such as clams, levering them out of the sea bed with their tusks and sucking the flesh out.
Antarctic fur seal (R) – this delicate otariid has a longer neck and pointier nose than its cousins as well as particularly long vibrasii (whiskers). Like many fur seals they were nearly hunted to extinction in the 19th century but a few colonies survived and have slowly recovered, with most of the population living on King George Island. One of their main predators is also a pinniped (the leopard seal).