Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) behind Polar bear (Ursus maritimus) framed by its legs, Svalbard, Norway, July.

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) behind Polar bear (Ursus maritimus), Svalbard, Norway, July.

Steven Kazlowski / Two Ivory gulls (Pagophilia eburnea) in flight, one chasing the other away from a dead fin whale carcass along the coast of Svalbard, Norway

Staffan Widstrand / Two Ivory gulls camouflaged on ice {Pagophila eburnea / alba} Baffin Island, Canada

Staffan Widstrand / Ivory gull in flight {Pagophila eburnea / alba} Qaanaaq, Greenland.

Tony Heald / Ivory gull (Pagophila eburnea) Svalbard, Norway, July.

Ole Jorgen Liodden / Polar bear (Ursus maritimus) feeding on seal with Ivory gulls (Pagophila eburnea) standing by, Svalbard, Norway September

Ole Jorgen Liodden / Ivory Gull (Pagophila eburnea) in flight, Svalbard, Norway September

Oriol Alamany / Ivory gull (Pagophila eburnea) resting on sea ice in the Arctic Ocean, Svalbard Islands, Norway, July

Oriol Alamany / Ivory gull (Pagophila eburnea) resting on sea ice in the Arctic Ocean, Svalbard Islands, Norway, July

Oriol Alamany / Ivory gull (Pagophila eburnea) rflying from sea ice in the Arctic Ocean, Svalbard Islands, Norway, July

Staffan Widstrand / Two Ivory gulls (Pagophila eburnea) standing on snow, one of them is cleaning itself, Svalbard, Norway, Arctic, September

Ole Jorgen Liodden / Two Ivory gulls (Pagophila eburnea) on ice, Storfjorden, Svalbard, Norway, June.

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) drinking with reflection in water, Svalbard, Norway, July.

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) drinking with reflection in water, Svalbard, Norway, July.

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) in flight, front view, Svalbard, Norway, July.

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) in flight in front of blue ice, Spitsbergen, Svalbard, Norway. July.

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) in flight in front of blue ice, Svalbard, Norway. July.

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) in flight, Storfjorden, Svalbard, Norway, June.

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) profile, Svalbard, Norway, August.

Ole Jorgen Liodden / Ivory gull (Pagophila eburnea) flying near blue ice, Spitsbergen, Svalbard, Norway, July.

Pal Hermansen / Polar bear (Ursus maritimus) with seal prey, with Glaucous gull (Larus hyperboreus) and Ivory gull (Pagophila eburnea), Franz Josef Land, arctic Russia.

Pal Hermansen / Ivory gull (Pagophila eburnea) and Arctic skua (Stercorarius parasitcus) over ice, Franz Josef land, Arctic Russia, July.

Roy Mangersnes / Ivory gull (Pagophila eburnea) feeding in melting ocean ice, North of Svalbard, Norway, July.

Roy Mangersnes / Ivory gull (Pagophila eburnea) feeding in melting ocean ice, North of Svalbard, Norway, July.

Roy Mangersnes / Ivory gull (Pagophila eburnea) in flight against a white sky, Svalbard, Norway, July.

Steven Kazlowski / Ivory gull (Pagophilia eburnea) adult in flight, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska

Danny Green / Ivory gull (Pagophila eburnea) adult resting on ice, Svalbard, August. Bookplate from Danny Green's 'The Long Journey North'

Ole Jorgen Liodden / Ivory Gull (Pagophila eburnea) resting on ice. Spitsbergen, Svalbard, August.

Ole Jorgen Liodden / Ivory Gull (Pagophila eburnea) resting on ice. Spitsbergen, Svalbard, August.

Ole Jorgen Liodden / Ivory Gull (Pagophila eburnea) in flight. Spitsbergen, Svalbard, August.

Ole Jorgen Liodden / Ivory Gull (Pagophila eburnea) resting on ice. Spitsbergen, Svalbard, August.

Ole Jorgen Liodden / Ivory Gull (Pagophila eburnea) resting on ice. Spitsbergen, Svalbard, August.

Bryan and Cherry Alexander / Ivory gull (Pagophila eburnea) in flight. Spitsbergen, Svalbard, Norway, June.

Brent Stephenson / Ivory Gulls (Pagophila eburnea) perched on an iceberg, one just about to take off. Van Keulenfjord, Svalbard, July.

Steven Kazlowski / Ivory gulls (Pagophilia eburnea) fighting over a nearby Fin whale carcass (Balaenoptera physalus) coastal Svalbard, Norway.

Steven Kazlowski / Ivory gull (Pageophilia eburnea) scavenging the carcass of a Fin whale (Balaenoptera physalus) floating along the coast of Svalbard, in summer, Norway

Steven Kazlowski / An adult Ivory gull (Pageophilia eburnea) flying over the coast of Svalbard in summer, Norway

Steven Kazlowski / An Ivory gull (Pagophila eburnea) chases another away from a dead Fin whale (Balaenoptera physalus) carcass along the coast of Svalbard, in summer, Norway

Gerrit Vyn / Adult Ivory Gull (Pagophila eburnea). This arctic dependent species appears to be declining rapidly due to climate change. Resolute, Nunavut, Canada. June.

Gerrit Vyn / Adult Ivory Gull (Pagophila eburnea) resting on sea ice. This arctic dependent species appears to be declining rapidly due to climate change. Resolute, Nunavut, Canada. June.

Steven Kazlowski / Ivory gull (Pageophilia eburnea) scavenging on the carcass of a Fin whale (Balaenoptera physalus) Svalbard, Norway, August 2009

Steven Kazlowski / Two Ivory gulls (Pagophilia eburnea) in flight, one chasing the other away from a dead fin whale carcass along the coast of Svalbard, Norway

Onne van der Wal / Ivory gull (Pagophila eburnea / alba) perched on a boat in Spitsbergen, Svalbard, Norway, 1998.

Espen Bergersen / Close up of Ivory gull (Pagophila eburnea) on Kronebreen glacier. Svalbard, Norway. August.

Espen Bergersen / Ivory gull (Pagophila eburnea) on Kronebreen glacier. Svalbard, Norway. August.

Espen Bergersen / Ivory gull (Pagophila eburnea) on Kronebreen glacier. Svalbard, Norway. August.

Andy Rouse / Ivory Gull (Pagophila eburnea) On iceberg Svalbard