Pete Oxford / Steller's sealions diving into sea {Eumetopias jubata} Commander Is, Russia

Marie Read / Abstract patterns of reflected sky and clouds on the ocean with a silhouetted Red-faced cormorant (Phalarocorax urile) in flight, St. Paul Island, Pribilof Islands, Alaska, USA, July.

Gerrit Vyn / Spotted seal (Phoca largha) pup resting on a the gravel beach of the Bering Sea. Chukotka, Russia. July.

Jeff Wilson / Crew member of the US coastguard ship 'Healy' standing on the sea ice in front of the ship's hull after the ship became stuck in the ice, Bering Sea, Alaska, USA, March 2008. Taken on location for the...

Jeff Wilson / View through the porthole of science teams and Frozen Planet film crew working on the sea ice in the Bering Sea, Alaska, USA, March 2008. The film crew were in search of Spectacled eider ducks, temper...

Todd Pusser / Dall's porpoise at surface {Phocoenoides dalli}, Central Bering Sea, Alaska

Todd Pusser / Killer whale surfacing {Orcinus orca}, Pribilof Islands, Bering Sea, Alaska, USA

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

Yva Momatiuk & John Eastcott / Pacific Walrus (Odobenus rosmarus divergens) bull portrait on coastal rocks in haul-out cove, summer, Round Island, Bering Sea, Bristol Bay, Alaska

Jenny E. Ross / Black-legged kittiwake (Rissa tridactyla) juvenile swimming in a small freshwater pond near the shore of Verkhoturova Island, Koryaksky Nature Reserve, Bering Sea, Kamchtaka, Russia.

Jenny E. Ross / Slaty-backed gulls (Larus schistisagus) and Black-legged kittiwakes (Rissa tridactyla) on the shore of Verkhoturova Island, Koryaksky Nature Reserve, Bering Sea, Kamchtaka, Russia.

Jenny E. Ross / Arctic tundra with frost-wedging features caused by repeated freeze-thaw processes in rocky soil, and surface water accumulation from melting permafrost. Wrangel Island, Siberian Arctic, Chukchi Sea,...

Jenny E. Ross / Arctic tundra with frost-wedging features caused by repeated freeze-thaw processes in rocky soil, and surface water accumulation from melting permafrost. Wrangel Island, Siberian Arctic, Chukchi Sea,...

Jenny E. Ross / Ecotourists have a close encounter with a curious adult female orca (Orcinus orca, aka killer whale) near Arakamchechen Island in the Bering Sea, Chukotka, Russia.

Jenny E. Ross / Whale bones arranged by indigenous people at the ancient Chukchi site currently known as 'Whalebone Alley' on Yttygran Island in the Bering Sea, Chukotka, Russia.

Jenny E. Ross / Detail of an abandoned building in Provideniya, Russia. Provideniya is situated at the edge of Komsoloskaya Bay (a part of Provideniya Bay) in the Bering Sea, Russia.

Jenny E. Ross / View of the main street in Provideniya, Russia. Provideniya is situated at the edge of Komsoloskaya Bay, Bering Sea, Russia.

Jenny E. Ross / Large piles of coal and coal ash lie on the ground at the Port of Provideniya, very close to the water's edge, at the shore of Komsoloskaya Bay , Bering Sea, Russia.

Jenny E. Ross / Early morning view of Provideniya, Russia from Komsoloskaya Bay, Bering Sea, Russia.

Jenny E. Ross / Steller sea lions (Eumetopias jubatus) swimming in the Bering Sea near Verkhoturova Island, Russia.

Jenny E. Ross / Steller sea lions (Eumetopias jubatus) resting on off-shore rocks in the Bering Sea near Verkhoturova Island, Russia.

Jenny E. Ross / Seabird colony on off-shore rocks in the Bering Sea near Verkhoturova Island, Russia. The nesting species include common and Brunnich's guillemots (Uria aalge and Uria lomvia arra -- also known as...

Jenny E. Ross / Ecotourists view a seabird colony on off-shore rocks in the Bering Sea near Verkhoturova Island, Russia. The nesting species include common and Brunnich's guillemots (Uria aalge and Uria lomvia ar...

Jenny E. Ross / Seabird colony on off-shore rocks in the Bering Sea near Verkhoturova Island, Russia. The nesting species include common and Brunnich's guillemots (Uria aalge and Uria lomvia arra -- also known as...

Jenny E. Ross / Seabird colony on Verkhoturova Island in the Bering Sea, Russia. Nesting species include common and Brunnich's guillemots (Uria aalge and Uria lomvia arra -- also known as the common murre and thi...

Jenny E. Ross / Seabird colony on Verkhoturova Island in the Bering Sea, Russia. Nesting species include common and Brunnich's guillemots (Uria aalge and Uria lomvia arra -- also known as the common murre and thi...

Jenny E. Ross / Seabird colony on Verkhoturova Island in the Bering Sea, Russia. Nesting species include common and Brunnich's guillemots (Uria aalge and Uria lomvia arra -- also known as the common murre and thi...

Jenny E. Ross / Pelagic cormorant (Phalacrocorax pelagicus) flies from the water after catching a tiny fish, in the Bering Sea near Medny Island in the Commander Islands, Russia.

Jenny E. Ross / Peschanaya Bay, Medny Island, Commander Islands, Russia. Dramatic escarpments, glacial cirques, and beautiful small beaches are prominent features of Medny Island in Russia's Commander Islands (ak...

Jenny E. Ross / Peschanaya Bay, Medny Island, Commander Islands, Russia. Dramatic escarpments, glacial cirques, and beautiful small beaches are prominent features of Medny Island in Russia's Commander Islands (ak...

Jenny E. Ross / The skeleton of an extinct Steller's Sea Cow (Hydrodamalis gigas), on display in the small museum at Nikolskoye, Bering Island, Commander Islands (aka Komandorski Islands), Russia

Jenny E. Ross / Harbor seal (Phocal vitulina) pup resting on barnacle-encrusted offshore rocks in the Bering Sea near Medny Island in the Commander Islands, Komandorsky Nature Reserve, Russia. July.

Jenny E. Ross / Pacific walruses (Odobenus rosmarus divergens) come ashore at a gravel beach where there is a small walrus haul-out, Arakamchechen Island in the Bering Sea, Chukotka, Russia.

Jenny E. Ross / Pacific walruses (Odobenus rosmarus divergens) at a small haul-out on Arakamchechen Island in the Bering Sea, Chukotka, Russia.

Jenny E. Ross / Pacific walruses (Odobenus rosmarus divergens) at a small haul-out on Arakamchechen Island in the Bering Sea, Chukotka, Russia.

Jenny E. Ross / Pacific walruses (Odobenus rosmarus divergens) in the Bering Sea, swimming toward shore at a gravel beach where there is a small walrus haul-out on Arakamchechen Island, Chukotka, Russia.

Jenny E. Ross / Whale bones placed in a ritual formation by indigenous people at the ancient sacred site currently known as 'Whalebone Alley' on Yttygran Island in the Bering Sea, Chukotka, Russia.

Jenny E. Ross / Whale bones placed in a ritual formation by indigenous people at the ancient sacred site currently known as 'Whalebone Alley' on Yttygran Island in the Bering Sea, Chukotka, Russia.

Marie Read / Tufted puffins (Fratercula cirrhata) pair flying over ocean pattern of kelp and foam, St. Paul Island, Pribilof Islands, Alaska, USA, July.

Sylvain Cordier / Siberian Yupiks who have killed two walruses returning to their village by boat, Preobrazheniya Bay, Chukotka, Russia.

Loic Poidevin / House on the Bering Sea Coast on the tundra, Sewards Peninsula, Nome, Alaska, USA, September

Loic Poidevin / Inuit houses and tents, Bering Sea Coast, Sewards Peninsula, Nome, Alaska, USA, September.

Gerrit Vyn / Tidal tundra edge looking inland from the Bering Sea. Yukon Delta National Wildlife Refuge, Alaska, USA. September.

David Tipling / Tufted puffin (Fratercula cirrhata) calling on cliff top, St Paul Island, Pribilof Islands, Bering Sea, Alaska.

Sue Flood / Crested auklets (Aethia cristatella) large flock cal in flight above Yankicha Island in the Kuril Island chain, Russian Far East, June.

Steven Kazlowski / Least auklet (Aethia pusilla) perched on a rock outcropping on Saint Paul Island, Alaska, Bering Sea, USA

Steven Kazlowski / Walrus (Odobenus rosmarus) a cow fights off a bull's advances at the end of mating season, Bering Sea, off the coast of Alaska, USA

Gerrit Vyn / Lesser Sandhill cranes (Grus canadensis) riding thermals in migration along the Alaska Range near Mt. McKinley. These birds are from the mid-continent population that nest across Northcentral Canada t...