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.

Michael Milicia/ BIA / Ivory Gull (Pagophila eburnea), Massachusetts

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