Andy Rouse / Polar Bear (Ursus maritimus) portrait in sea-ice landscape. Wide angle / fish-eye shot. Svalbard, Norway, September.

Ole Jorgen Liodden / Arctic tern (Sterna paradisaea) attacking an Arctic Fox (Vulpes / Alopex lagopus) protecting its nest site, Spitsbergen, Svalbard, Norway. Highly commended, MAMMALS, GDT 2011 competition

Steven Kazlowski / Polar bear (Ursus maritimus) on sea ice, off the coast of Svalbard, Norway

John Shaw / Common eider duck (Somateria mollissima) female defending her nest from arctic fox (Vulpes lagopus). Longyearbyen, Spitsbergen. June.

Sven Zacek / Bearded seal (Erignathus barbatus) sunbathing on iceberg broken off from glacier. Kongsfjorden fjord, Spitsbergen, Norway. June 2014.

Ingo Arndt / Svalbard reindeers (Rangifer tarandus platyrhynchus) running in snow, winter, Spitsbergen, Svalbard, Norway, April

Ingo Arndt / Polar Bear (Ursus maritimus) on icefield with moon in late winter, Svalbard, Spitsbergen, Norway, April

Ingo Arndt / Polar Bear (Ursus maritimus) on icefield with moon in late winter, Svalbard, Spitsbergen, Norway, April

Ingo Arndt / Polar Bear (Ursus maritimus) on icefield with moon in late winter, Svalbard, Spitsbergen, Norway, April

Roland Seitre / Svalbard reindeer (Rangifer tarandus platyrhynchus) with antlers, Longyearbyen, Spitsbergen, Svalbard, Norway, April.

Roland Seitre / Svalbard reindeer (Rangifer tarandus platyrhynchus) with antlers, Longyearbyen, Spitsbergen, Svalbard, Norway

Sven Zacek / Walruses (Odobenus rosmarus) fighting over a resting place on snow, Magdalenefjorden Fjord, Svalbard, Spitsbergen, Norway, June.

Sven Zacek / Walrus (Odobenus rosmarus) swimming towards a camera, Magdalenefjorden Fjord, Svalbard, Spitsbergen, Norway. June.

Jenny E. Ross / Svalbard reindeer (Rangifer tarandus platyrhynchus) jumping across a narrow gully, Eidembukta, Spitsbergen, Svalbard, Norway. August.

Sven Zacek / View through glacier ice towards snow-covered mountains in Kongsfjorden fjord in Svalbard, Norway. June 2015.

Franco Banfi / Walrus (Odobenus rosmarus) two swimming underwater, Spitsbergen, Svalbard Archipelago, Norway, Arctic Ocean. July.

Franco Banfi / Walrus (Odobenus rosmarus) two swimming underwater, Spitsbergen, Svalbard Archipelago, Norway, Arctic Ocean. July.

Franco Banfi / Walrus (Odobenus rosmarus) swimming underwater, Spitsbergen, Svalbard Archipelago, Norway, Arctic Ocean. July.

Franco Banfi / Walrus (Odobenus rosmarus) Spitsbergen, Svalbard Archipelago, Norway, Arctic Ocean. July.

Franco Banfi / Walrus (Odobenus rosmarus) hauled out in shallow water, Spitsbergen, Svalbard Archipelago, Norway, Arctic Ocean. July.

Franco Banfi / Walrus (Odobenus rosmarus) male and female, hauled out in shallow water, Spitsbergen, Svalbard Archipelago, Norway, Arctic Ocean. July.

Peter Cairns / Svalbard reindeer (Rangifer tarandus platyrhynchus) backlit in evening light, Spitsbergen, Svalbard, Norway, August.

Staffan Widstrand / Bearded seal (Erignathus barbatus) hauled out on ice, Spitsbergen, Svalbard, Norway, September.

Staffan Widstrand / Arctic fox (Vulpes lagopus) in winter coat, resting in grass, Spitsbergen, Svalbard, Norway, September.

Staffan Widstrand / Arctic fox (Vulpes lagopus) in winter coat, sitting, Spitsbergen, Svalbard, Norway, September

Staffan Widstrand / Svalbard reindeer (Rangifer tarandus platyrhynchus) with bloody antlers shedding velvet, Spitsbergen, Svalbard, Norway, September

Staffan Widstrand / Two Svalbard reindeer (Rangifer tarandus platyrhynchus) fighting; antlers shedding velvet; Spitsbergen, Svalbard, Norway, September

Ole Jorgen Liodden / Arctic fox (Alopex lagopus lagopus) grooming in summer fur, Spitsberg, Svalbard, Norway, August.

Ole Jorgen Liodden / Arctic fox (Alopex lagopus lagopus) in summer fur, close up portrait while resting Spitsberg, Svalbard, Norway, August.

Ole Jorgen Liodden / Arctic fox (Alopex lagopus lagopus) mid moult into summer fur, back lit portrait, Spitsbergen, Svalbard, Norway, June.

Ole Jorgen Liodden / Polar bear (Ursus maritimus) walking across vast ice floe, Spitsbergen, Svalbard, July 2013.

Ole Jorgen Liodden / Arctic tern (Sterna paridisea) mobbing, Arctic fox (Alopex lagopus) in Spitsbergen, Svalbard, Norway, July.

Ole Jorgen Liodden / Bearded seal (Erignathus barbatus) hauled out on ice, Spitsbergen, Svalbard, Norway, July.

Roy Mangersnes / Full moon over Adventsdlen, Longyearbyen, Svalbard, Norway, April.

Roy Mangersnes / Polar bears (Ursus maritimus) courting on ocean ice north of Spitsbergen, Svalbard, Norway, July.

Ole Jorgen Liodden / Svalbard reindeer (Rangifer tarandus platyrhyncus) feeding at sunset, Spitsbergen, Svalbard, Norway, April.

Roy Mangersnes / Brunnich's guillemot (Uria lomvia) diving into sea, Spitsbergen, Svalbard, Norway, July.

Roy Mangersnes / Brunnich's guillemots (Uria lomvia) on sea, Spitsbergen, Svalbard, Norway, July.

Roy Mangersnes / Brunnich's guillemots (Uria lomvia) on sea, Spitsbergen, Svalbard, Norway, July.

Roy Mangersnes / Female Polar bear (Ursus maritimus) with two large cubs on an ice floe, Spitsbergen, Svalbard, Norway, July. Vulnerable Species.

Roy Mangersnes / Female Polar bear (Ursus maritimus) with two large cubs on an ice floe, Spitsbergen, Svalbard, Norway, July. Vulnerable Species.

Roy Mangersnes / Bearded seal (Erignathus barbatus) stretching flipper, on an ice floe, Spitsbergen, Svalbard, Norway, July.

Roy Mangersnes / Brunnich's guillemot (Uria lomvia) in flight low over sea, Spitsbergen, Svalbard, Norway, June.

Danny Green / Fulmer (Fulmras glacialis) in flight near blue glacier, Svalbard, July. Bookplate from Danny Green's 'The Long Journey North'

Florian Möllers / Arctic expedition cruiseship M/S Stockholm in heavy sea and gale winds at Sarkapp (South Cape), Svalbard, Norway, July 2012

Florian Möllers / Blue iceberg drifting off Brasvellbreen glacier, Austfonna, Nordaustlandet, Svalbard, Norway, July 2012

Staffan Widstrand / Coastal ice, Svalbard, Norway, July 2011

Staffan Widstrand / Kayaking past icebergs in Svalbard, Norway, July 2011. Model released.