Pregnant female southern elephant seal (Mirounga leonina) giving birth on the beach in Stromness Bay, South Georgia Island

Adult male Antarctic fur seal (Arctocephalus gazella) head detail, Antarctica, Southern Ocean, Polar Regions

Humpback whale (Megaptera novaeangliae) flukes-up dive in the Weddell Sea near the Antarctic Peninsula, Antarctica, Polar Regions

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

California sea lions (Zalophus californianus), grouped together on a channel marker off Newport Beach, California, United States of America, North America

Southern Right Whale (Eubalaena australis) adult surfacing near Puerto Pyramides, Peninsula Valdez, Argentina

California sea lions (Zalophus californianus), grouped together on a channel marker off Newport Beach, California, United States of America, North America