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

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

Terry Whittaker / Arctic fox (Vulpes lagopus) feeding in snow, blue colour morph, Hornstrandir Nature Reserve, Iceland, March.

Andy Rouse / Mountain Hare (Lepus timidus) in blizzard, Scotland, UK. January.

Frederique Olivier / Close-up of a group of Emperor penguin (Aptenodytes forsteri) chicks huddled together in a blizzard, covered in snow, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) chicks huddled together during a blizzard, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguins (Aptenodytes forsteri) walking in blizzard, Adelie Land, Antarctica, January.

Frederique Olivier / Emperor penguins (Aptenodytes forsteri) walking and tobogganing in blizzard, Adelie Land, Antarctica, January.

SCOTLAND: The Big Picture / Scots pine trees (Pinus sylvestris) in heavy snowfall, Cairngorms National Park, Scotland, UK, January.

SCOTLAND: The Big Picture / Mountain hare (Lepus timidus) sheltering in blizzard conditions, Cairngorms National Park, Scotland, UK, January.

Francisco Marquez / Common crane (Grus grus) in a blizzard, Gallocanta Lake, Aragon, Spain, February.

Eric Baccega / Small herd of Muskox (Ovibos moschatus) feeding in a blizzard, Banks Island, Northwest Territories, Canada.