Heike Odermatt / Walrus (Odobenus rosmarus), Hinlopen Strait, Svalbard, Norway

Jordi Chias / Antarctic fur seal (Arctocephalus gazella), Antarctic Peninsula, Antarctica.

SCOTLAND: The Big Picture / Eurasian otter (Lutra lutra) portrait, Scotland, UK, April.

Alex Mustard / Grey seal (Halichoerus grypus) split level of young seal investigating the camera with its nose and whiskers, close to shore. Lundy Island, Devon, UK, Bristol Channel. August

Alex Mustard / Grey seal (Halichoerus grypus) young female opens her mouth and blows bubbles through her nose playfully while she looks up from the seabed. Lundy Island, Devon, UK, Bristol Channel. August. Highly co...

Alex Mustard / Grey seal (Halichoerus grypus) playful young seal above a kelp forest. Lundy Island, Devon, UK Bristol Channel, August

Alex Mustard / Grey seal (Halichoerus grypus) split level view of young investigating camera lens, Lundy Island, Devon, UK, Bristol Channel, August

Cyril Ruoso / South American fur seal (Arctocephalus australis) male head profile, Punta San Juan, Peru

Alex Mustard / Harbour seal (Phoca vitulina) in the kelp forest (Macrocystis pyrifera). Santa Barbara Island, Channel Islands. Los Angeles, California, United States of America. North East Pacific Ocean.

Tony Wu / Juvenile Australian sea lion (Neophoca cinerea) resting in shallows, possibly to thermoregulate, Carnac Island, Western Australia.

Donald M. Jones / Sea Otter (Enhydra lutris) mother and pup, Prince William Sound, Alaska

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) females socializing, Punta Espinosa, Fernandina Island, Galapagos Islands, Ecuador