David Tipling / Northern fur seal (Callorhinus ursinus) bull. St Paul Island, Pribilof's, Bering Sea, Alaska

Sue Flood / Northern fur seal (Callorhinus ursinus) at sea surface, Skaly Lovushky, the Kuril Islands, Russian Far East

Sue Flood / Northern fur seals (Callorhinus ursinus) looking down on breeding colony with male, female and new born pups all resting on Tyuleniy Island, Russian Far East, June.

Sue Flood / Northern fur seals (Callorhinus ursinus) breeding colony with male, female and new born pups all resting on Tyuleniy Island, Russian Far East, June.

Sue Flood / Northern fur seal (Callorhinus ursinus) female nursing new born pup with others behind, Tyuleniy Island, Russian Far East, June

Sue Flood / Northern fur seal (Callorhinus ursinus) male, female and new born pup on Tyuleniy Island, Russian Far East, June

Oriol Alamany / Northern fur seal (Callorhinus ursinus) colony on beach, Zapadni Rookery, Saint Paul Island, Pribilof Islands, Alaska, USA

Oriol Alamany / Northern fur seal (Callorhinus ursinus) colony with St George village in the distance, Saint George Island, Pribilof Islands, Alaska, USA

Oriol Alamany / Northern fur seal (Callorhinus ursinus) male with females and pups, Saint George Island, Pribilof Islands, Alaska, USA

Oriol Alamany / Northern fur seal (Callorhinus ursinus) male with females, Reef Rookery, Saint Paul Island, Pribilof Islands, Alaska, USA

Oriol Alamany / Northern fur seal (Callorhinus ursinus) on rock calling, Saint George Island, Pribilof Islands, Alaska, USA

Oriol Alamany / Northern fur seal (Callorhinus ursinus) male with females and pups, Saint George Island, Pribilof Islands, Alaska, USA

Oriol Alamany / Northern fur seal (Callorhinus ursinus) male calling, Reef Rookery, Saint Paul Island, Pribilof Islands, Alaska, USA

Oriol Alamany / Northern fur seal (Callorhinus ursinus) females with pups, Saint George Island, Pribilof Islands, Alaska, USA

Matthias Breiter / Northern Fur Seal (Callorhinus ursinus) rookery, Pribilof Islands, Alaska

Matthias Breiter / Northern Fur Seal (Callorhinus ursinus) bulls displaying, Pribilof Islands, Alaska

Matthias Breiter / Northern Fur Seal (Callorhinus ursinus) bull and harem, Pribilof Islands, Alaska

Matthias Breiter / Northern Fur Seal (Callorhinus ursinus) bulls displaying, Pribilof Islands, Alaska

Matthias Breiter / Northern Fur Seal (Callorhinus ursinus) bull, Pribilof Islands, Alaska

Tim Fitzharris / Northern Fur Seal (Callorhinus ursinus) on beach

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) portrait of young bull in summer, St Paul Island, Pribilof Islands, Alaska

Gerry Ellis / Northern Fur Seal (Callorhinus ursinus) portrait on beach northeastern Pacific Coast, North America, vulnerable

DAVID TIPLING / Northern fur seal {Callorhinus ursinus} bull. St Paul Island, Pribilof's,> Bering Sea, Alaska.

Tom Vezo / Northern fur seal {Callorhinus ursinus} St Paul Is, Pribilofs, Alaska

DAVID TIPLING / Northern fur seal {Callorhinus ursinus} bull. St Paul Island, Pribilof's,> Bering Sea, Alaska.

DAVID TIPLING / Northern fur seal rookery {Callorhinus ursinsu} Aleut St Paul Is Pribilof Islands Alaska

Todd Pusser / Northern fur seal portrait {Callorhinus ursinus} St Paul Is, Alaska, USA

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) adult non-territorial male on coastal rocks, St Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) female raising front flipper to cool herself, Saint Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) cross-section of seal fur shows dense growth of about 300, 000 hairs per square inch, St Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) three long hind flipper with vestigious toenails, St Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) portrait of non-territorial adult bull in haulout, Bering Sea, St George Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) entangled sub-adult male on beach, he was disentangled and freed, St Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) harem group in large rookery, St Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) young male body-surfing in shallow water near bachelor haul-out beach, summer, St Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) female sleeping in rookery, summer season, St Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) young bull entangled in net has swollen neck and cuts, Bering Sea, Saint George Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) immature and mature males herded on beach to look for entangled animals, St Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) portrait of adult non-territorial male, St Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) bull on haul out beach in summer, Saint George Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) sub-adult and non-territorial bulls resting on haul out beach in summer, St Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) mass of breeding females sleep and pant close together to dissipate heat on warm day, St Paul Island, Pribilof Islands, Alaska

Pete Oxford / Northern fur seal male and harem {Callorhinus ursinus} Bering Is, Russia Mys

DAVID TIPLING / Northern fur seal (Callorhinus ursinus). St Paul Island, Pribilof's, Bering Sea, Alaska

DAVID TIPLING / Northern fur seal (Callorhinus ursinus) bull. St Paul Island, Pribilof's, Bering Sea, Alaska

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) non-territorial bulls and sub-adult males congregate on haul out beach, St Paul Island, Pribilof Islands, Alaska

Tom Vezo / Northern fur seal colony {Callorhinus ursinus} St Paul Island, Pribilofs Alaska

Pete Oxford / Northern fur seal colony on beach {Callorhinus ursinus} Bering island, Russia

Tom Vezo / Northern fur seal {Callorhinus ursinus} St Paul Is, Pribilofs, Alaska

Tom Vezo / Northern fur seal bull with harem {Callorhinus ursinus} St Paul Is, Alaska, USA Pribilofs

Pete Oxford / Northern fur seal rookery {Callorhinus ursinus} Bering Islands Commander Islands Russia

Tom Vezo / Northern fur seal family group {Callorhinus ursinus} Pribilofs Alaska USA St Paul Island

Sue Flood / Northern fur seal sleeping with flippers folded {Callorhinus ursinus} California USA May 1998

Tom Vezo / Northern fur seal male with females {Callorhinus ursinus} St Paul Island Pribilofs Alaska