Skull of an adult female leopard seal (Hydrurga leptonyx), on display at the Natural History Museum in Stanley, Falkland Islands, South America

Adult bull southern elephant seal (Mirounga leonina), skull on display at the Natural History Museum in Stanley, Falklands, South America

Crabeater seal (Lobodon carcinophaga) skull on the beach on Bird Island, Antarctica

Weddell seal (Leptonychotes weddellii) skull (note the cusped teeth) on the beach near the Antarctic Peninsula. Weddell seals used to be hunted as food for dog sled teams.