Doc White / Sea Otter, (Enhydra lutris), young male, Elkhorn Slough, California, USA. January

Danny Green / Sea otter (Enhydra lutris) resting on sea ice, Alaska, USA, June

Danny Green / Sea otter (Enhydra lutris) resting amongst sea ice, Alaska, USA, June

Danny Green / Sea otters (Enhydra lutris) resting on ice, Alaska, USA, June

Frederique Olivier / Northern sea otter (Enhydra lutris kenyoni) sleeping at dusk, Kachemak Bay, Alaska, USA.

Frederique Olivier / Northern sea otter (Enhydra lutris kenyoni) swimming, floating on its back, Kachemak Bay, Alaska, USA.

Frederique Olivier / Northern sea otter (Enhydra lutris kenyoni) sleeping, floating on the surface, Kachemak Bay, Alaska, USA.

Danny Green / Three Sea otters (Enhydra lutris) resting on ice, Alaska, June

Doc White / California sea otter (Enhydra lutris) feeding on Northern kelp crab, Monterey Bay, California, USA, Eastern Pacific Ocean, May

Suzi Eszterhas / Sea Otter (Enhydra lutris) orphaned pup, three weeks old, Alaska SeaLife Center, Seward, Alaska

Suzi Eszterhas / Sea Otter (Enhydra lutris) mother with three day old newborn pup, Monterey Bay, California

Suzi Eszterhas / Sea Otter (Enhydra lutris) mother and three day old newborn pup, Monterey Bay, California