Terry Whittaker / Arctic fox (Alopex lagopus) cubs playing, Hornvik, Hornstrandir, West Fjords, Iceland. April.

Sergey Gorshkov / Arctic fox (Alopex lagopus) juveniles play fighting, Wrangel Island, Far East Russia, August.

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 / White Arctic fox (Alopex lagopus) in its winter fur looking at the camera, Svalbard, Norway, Arctic, September

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) grooming in summer fur, 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 / Arctic tern (Sterna paridisea) mobbing, Arctic fox (Alopex lagopus) in Spitsbergen, Svalbard, Norway, July.

Erlend Haarberg / Arctic fox (Alopex lagopus) cubs looking curiously, Dovrefjell-Sunndalsfjella National Park, Norway, July.

Erlend Haarberg / Arctic fox (Alopex lagopus) silhouetted against stormy sky, Dovrefjell-Sunndalsfjella National Park, Norway, July.

Erlend Haarberg / Arctic fox (Alopex lagopus) cubs playing, Dovrefjell-Sunndalsfjella National Park, Norway, July.