Ben Cranke / Arctic Redpoll (Carduelis hornemanni) perched on frosty plant, Finland. February.

Staffan Widstrand / Common redpoll (Acanthis flammea) Varanger National Park, Arctic Norway

Staffan Widstrand / Arctic redpoll or Hoary redpoll (Acanthis hornemanni) Varanger National park, Arctic Norway

Staffan Widstrand / Common Redpoll (Acanthis flammea) Varanger National Park, Arctic Norway

Staffan Widstrand / Common Redpoll (Acanthis flammea) Varanger National Park, Arctic Norway

Staffan Widstrand / Arctic redpoll or Hoary redpoll (Acanthis hornemanni) Varanger National park, Arctic Norway

Hans Glader/ BIA / Hoary Redpoll (Carduelis hornemanni) trio, Netherlands

Hans Glader/ BIA / Hoary Redpoll (Carduelis hornemanni), Netherlands

Jussi Murtosaari / Arctic redpoll (Carduelis hornemanni), adult male perched, Finland, January.

Jussi Murtosaari / Arctic redpoll (Carduelis hornemanni) with Common redpolls (Carduelis flammea) perched in frosty tree, Finland, January.

Jussi Murtosaari / Arctic Redpoll (Carduelis hornemanni), at winter, Lapland, Finland, April.

Markus Varesvuo / Arctic Redpoll (Carduelis hornemanni) perched on branches, Inari, Finland, April

Markus Varesvuo / Arctic redpoll (Carduelis hornemanni) male perched, Inari, Finland, March

Markus Varesvuo / Arctic Redpoll (Carduelis hornemanni), Inari, Finland, April

Markus Varesvuo / Arctic redpoll (Carduelis hornemanni) Inari, Finland April

Markus Varesvuo / Arctic Redpoll (Carduelis hornemanni), Male standing on snow, Inari Finland April

Jussi Murtosaari / Arctic redpoll (Carduelis hornemanni) Lapland, Finland, July.

Matthew Studebaker / Hoary Redpoll (Carduelis hornemanni), Ontario, Canada

Matthew Studebaker / Hoary Redpoll (Carduelis hornemanni), Alaska

Laurent Geslin / Arctic redpoll (Carduelis hornemanni) feeding on grass seeds in snow, near arctic circle, North Canada.

Robin Chittenden / Hornemann's Arctic Redpoll (Carduelis hornemanni hornemanni). Aldeburgh, Suffolk, UK, December.

Robin Chittenden / Hornemann's Arctic Redpoll (Carduelis hornemanni hornemanni). Aldeburgh, Suffolk, UK, December.

Robin Chittenden / Hornemann's Arctic Redpoll (Carduelis hornemanni hornemanni). Aldeburgh, Suffolk, UK, December.

Robin Chittenden / Hornemann's Arctic Redpoll (Carduelis hornemanni hornemanni). Aldeburgh, Suffolk, UK, December.

Robin Chittenden / Hornemann's Arctic Redpoll (Carduelis hornemanni hornemanni). Aldeburgh, Suffolk, UK, December.

Robin Chittenden / Hornemann's Arctic Redpoll (Carduelis hornemanni hornemanni). Aldeburgh, Suffolk, UK, December.

Robin Chittenden / Coues's Arctic Redpoll (Carduelis hornemanni exilipes) Kelling, Norfolk, UK February

Robin Chittenden / Coues's Arctic Redpoll (Carduelis hornemanni exilipes) Kelling, Norfolk UK February

Robin Chittenden / Coues's Arctic Redpoll (Carduelis hornemanni exilipes) on feeder, Kelling, Norfolk, UK February

Eric Baccega / Common Redpoll (Carduelis flammea) female perching on branch. Quebec, Canada, January.

Eric Baccega / Common Redpoll (Carduelis flammea) female perching on branch. Quebec, Canada, January.

Niall Benvie / Arctic redpoll (Carduelis hornemanni) perched on twig, Finland

Niall Benvie / Arctic redpoll (Carduelis hornemanni) perched on snowy tree branch, Finland

DAVID TIPLING / Arctic redpoll {Carduelis hornemanni} Finland

Mike Wilkes / Arctic redpoll {Carduelis hornemanni} Finland

Mike Read / Arctic redpoll {Carduelis hornemanni} Vardo Norway

Staffan Widstrand / Hoary redpoll (Acanthis hornemanni) perched on dead tree trunk, Varanger Peninsula, Finnmark, Norway. June.