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.

Tony Wu / Atlantic walrus (Odobenus rosmarus rosmarus), two hauled out on ice. Svalbard, Norway. July.

Orsolya Haarberg / Aerial view of eroded mountain slopes and rich network of river channels. Skansdalen, Spitsbergen, Svalbard, Norway

Erlend Haarberg / Fogbow over sea ice. Fogbows are similar to a rainbow, but produced by very small droplets in fog or cloud, which diffract light, instead of large raindrops which do not, Svalbard, Norway, July.