Ismaele Tortella / Eurasian otter (Lutra lutra) hunting in a shoal of Atlantic herring (Clupea harengus), northern Norway, March

Ismaele Tortella / Northern gannet (Morus bassanus) colony, chick climbing back into nest, with the midnight sun, Norway, July

Ismaele Tortella / Three Rock ptarmigan (Lagopus muta) feeding in winter plumage, city of Tromso in the background, northern Norway, March 2019.

Ismaele Tortella / Aerial tracking shot over Tromso in the winter, northern Norway, March 2019.

Ismaele Tortella / White tailed eagle (Haliaeetus albicilla) catching fish, Lofoten, Norway, August.

Ismaele Tortella / Four Eurasian elk (Alces alces) walking through vegetation , Norway, August

Ismaele Tortella / Svalbard reindeer (Rangifer tarandus platyrhynchus) feeding in snow, Svalbard, Norway, March.

Ismaele Tortella / Black-legged kittiwake (Rissa tridactyla) nesting above a window, Lofoten, Norway, August.

Ismaele Tortella / Tracking shot of a Whooper swan (Cygnus cygnus) family walking, Lofoten, northern Norway, August.

Ismaele Tortella / Reindeer (Rangifer tarandus), Kvaloya island, Tromso, Norway, November.

Pal Hermansen / Close up of Goshawk (Accipiter gentilis) feathers, with one foot held up, Trondelag, Norway. Winner of the Attention to Detail Category of the Bird Photographer Competition 2019.

Danny Green / Polar bear (Ursus maritimus) walking across sea ice, reflected in water. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) female resting with cubs on glacier. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) female and cubs feeding on Whale carcass. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) and two cubs feeding on Whale carcass. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) and cubs, standing on sea ice. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) and cubs resting on sea ice. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) female and cubs, one cub walking up slope of ice in foreground. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) and cubs feeding on Whale carcass. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) and cubs feeding on Whale carcass, on iceberg. Svalbard, Norway, July 2018.

Danny Green / Polar bear (Ursus maritimus) walking across ice, snow covered mountain in background. Svalbard, Norway, April 2018.

Danny Green / Polar bear (Ursus maritimus) resting in snow. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) licking paw, close-up. Svalbard, Norway, April.

Danny Green / Polar bear (Ursus maritimus) standing on glacier. Svalbard, Norway, July 2018.

Danny Green / Polar bear (Ursus maritimus) standing on ice. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) looking for food on ice. Svalbard, Norway, April.

Danny Green / Polar bear (Ursus maritimus) male standing beside rocks in frozen and snow covered landscape. Svalbard, Norway, April 2019.

Danny Green / Polar bear (Ursus maritimus) male walking across frozen landscape. Svalbard, Norway, April 2019.

Danny Green / Polar bear (Ursus maritimus) male in snow. Svalbard, Norway, April.

Danny Green / Polar bear (Ursus maritimus), male and female approaching each other across snow covered rocky landscape. Svalbard, Norway, April 2019.

Danny Green / Polar bear (Ursus maritimus) male approaching female on snow covered hill top. Svalbard, Norway, April 2019.

Danny Green / Polar bear (Ursus maritimus) male approaching female in rocky area covered in snow. Svalbard, Norway, April 2019.

Danny Green / Brunnich's guillemot (Uria lomvia) colony in mist, many birds in flight and nesting on cliffs. Svalbard, Norway, July 2018.

Danny Green / Arctic fox (Vulpes lagopus), two in snow covered landscape. Svalbard, Norway, April 2019.

Danny Green / Arctic fox (Alopex lagopus) standing on ice, in winter pelage. Svalbard, Norway, April.

Danny Green / RF - Polar bear (Ursus maritimus) male walking through snow covered landscape, mountains in background. Svalbard, Norway, April (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Arctic fox (Alopex lagopus) in winter pelage, camouflaged in snow. Svalbard, Norway, April (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Arctic fox (Alopex lagopus) sitting with summer pelage, tuft of fur on head. Svalbard, Norway, July. (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Reindeer (Rangifer tarandus) walking up slope in snow. Svalbard, Norway, April. (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Polar bear (Ursus maritimus) cub walking in snow. Svalbard, Norway, April. (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Polar bear (Ursus maritimus) female walking across ice. Svalbard, Norway, April. (This image may be licensed either as rights managed or royalty free.)

Danny Green / Arctic fox (Alopex lagopus) standing in tundra. Svalbard, Norway, July.

Danny Green / Ringed seal (Pusa hispida) and pup resting on ice. Svalbard, Norway. April.

Danny Green / Reindeer (Rangifer tarandus), two standing on ridge in blizzard. Svalbard, Norway. April.

Danny Green / Reindeer (Rangifer tarandus), two play fighting in snow. Svalbard, Norway, April.

Danny Green / Reindeer (Rangifer tarandus), two standing on ridge in snow. Svalbard, Norway, April.

Danny Green / Reindeer (Rangifer tarandus) standing on ridge in snow, another reindeer in background. Svalbard, Norway, April.

Danny Green / Reindeer (Rangifer tarandus) hunkering down in snow during blizzard. Svalbard, Norway, April.

Danny Green / Reindeer (Rangifer tarandus) walking in snow. Svalbard, Norway, April.

Danny Green / Polar bear (Ursus maritimus) female and cubs play fighting. Svalbard, Norway, March 2018.

Danny Green / Polar bear (Ursus maritimus) two walking in snowy landscape. Svalbard, Norway, April 2018.

Danny Green / Polar bear (Ursus maritimus) male female pair looking upwards, snow covered hills in background. Svalbard, Norway, April 2018.

Danny Green / Polar bear (Ursus maritimus) group on ice, female and cubs feeding on Whale carcass. Svalbard, Norway, June 2018.

Danny Green / Polar bear (Ursus maritimus) resting on sea ice, view from above. Svalbard, Norway, June 2018.

Danny Green / Polar bear (Ursus maritimus) hunting Seal on sea ice. Svalbard, Norway, July 2018.

Danny Green / Polar bear (Ursus maritimus), two cubs playing, leaping across sea ice, reflected in water. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus), two cubs walking on sea ice. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) cub ready to jump down from pack ice. Svalbard, Norway, April.

Danny Green / Arctic fox (Alopex lagopus) following scent, in winter pelage. Svalbard, Norway. April.

Danny Green / Arctic fox (Alopex lagopus) camouflaged in winter pelage. Svalbard, Norway, April.

Danny Green / Arctic fox (Alopex lagopus) in snow. Svalbard, Norway. April.

Danny Green / Ringed seal (Pusa hispida) resting on ice, reflected in water. Svalbard, Norway. July.

Guy Edwardes / Aurora borealis above sea stacks, Reykjanes Peninsula, Iceland. 2019.

Tony Heald / Glaucous Gull (Larus hyperboreus) taking off from ice, Svalbard Norway, July.

Theo Bosboom / Crashing waves at large basalt wall, Arnarstapi, Snaefellsnes, Iceland. May 2013

Theo Bosboom / Powerful waves rolling in at the Atlantic coast of Iceland near Dyrholey during a powerful winter storm. February 2016

Theo Bosboom / Wave breaking in front of the two famous sea stacks Risin and Kellingin on the Faroe Islands. March 2018.

Alex Mustard / Killer whales (Orcinus orca) at the surface in an Arctic fjord in Spildra, northern Norway, with sea birds. Arctic Ocean

Terry Whittaker / Man collecting seabird eggs, including those of Common guillemots (Uria aalge), Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland, May.

Terry Whittaker / Man being lowered down a cliff to collect seabird eggs, including those of Common guillemots (Uria aalge). Camera attached to helmet, Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland, May.

Terry Whittaker / Man being lowered down cliff to collect seabird eggs, including those of Common guillemots (Uria aalge), Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland, May.

Terry Whittaker / Man being raised up cliff to collect seabird eggs, including those of Common guillemots (Uria aalge), Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland, May.

Terry Whittaker / Man being lowered down a cliff to collect seabird eggs, including those of Common guillemots (Uria aalge). Camera attached to helmet, Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland, May.

Terry Whittaker / Man being lowered down a cliff to collect seabird eggs, including those of Common guillemots (Uria aalge). Camera attached to helmet, Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland, May.

Terry Whittaker / Man being lowered down a cliff to collect seabird eggs, including those of Common guillemots (Uria aalge). Camera attached to helmet, Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland, May.

Terry Whittaker / Man sorting seabird eggs, including those of Common guillemots (Uria aalge) into egg boxes, Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland, May.

Terry Whittaker / Man being lowered down a cliff to collect seabird eggs, including those of Common guillemots (Uria aalge). Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland, May.

Espen Bergersen / Long-finned pilot whale (Globicephala melas). Kvaloya, Norway.

Milan Radisics / Aerial view of large pieces of calved ice in a meltlake beneath Hoffellsjokull, an outlet glacier of the Vatnajokull ice cap, Iceland, August 2018

Milan Radisics / Aerial shot of yellow mineral sediments flowing into the Atlantic Ocean, near Stokkseyri, Southern Iceland, August 2018.

Milan Radisics / Aerial view of large pieces of calved ice in a meltlake beneath Hoffellsjokull, an outlet glacier of the Vatnajokull ice cap, Iceland, August 2018

Milan Radisics / Aerial view of large pieces of calved ice in a meltlake beneath Hoffellsjokull, an outlet glacier of the Vatnajokull ice cap, Iceland, August 2018

Milan Radisics / Aerial shot of the Austurfljot glacial river, southern Iceland, August 2018.

Milan Radisics / Aerial shot of the Austurfljot glacial river, southern Iceland, August 2018.

Milan Radisics / Aerial shot of the Hafursa glacial river running over black sand, southern Iceland, August 2018.

Milan Radisics / Aerial shot of steam geysers at Gunnhuver Hot Springs, Reykjanes Peninsula, Iceland, August 2018.

Milan Radisics / Aerial shot of steam geysers at Gunnhuver Hot Springs, Reykjanes Peninsula, Iceland, August 2018.

Milan Radisics / Aerial shot of the estuary of the Holmsa and Kudafljot glacial rivers, Grafarkirkja, Iceland, August 2018.

Milan Radisics / Aerial shot of Gunnuhver steam geyser, Gunnhuver Hot Springs, Reykjanes Peninsula, Iceland, August 2018.

Milan Radisics / Aerial shot of Thjorsa glacial river, southern Iceland, August 2018.

Milan Radisics / Aerial shot of Thjorsa glacial river, southern Iceland, August 2018.

Milan Radisics / Aerial shot of a mass of calved ice in a meltwater lake beneath Fjallsarlon Glacier, southern Iceland, August 2018.

Milan Radisics / Aerial shot of Gunnuhver steam geyser, Gunnhuver Hot Springs, Reykjanes Peninsula, Iceland, August 2018.

Milan Radisics / Aerial shot of cars on Route 1, passing through a lava flow landscape from the Laki eruption in June 1783, Skaftareldar, Iceland, August 2018.

Milan Radisics / Aerial view of Hoffellsjokull, an outlet glacier of the Vatnajokull ice cap, Iceland, August 2018

Milan Radisics / Aerial shot of Kudafljot glacial river flowing over black volcanic soil, Iceland, August 2018.