Marie Read / Snow buntings (Plectrophenax nivalis) flock in flight during a snowstorm, New York, USA, January.

Donald M. Jones / McCown's Longspur (Calcarius mccownii) with fluffed up feathers, Montana

Donald M. Jones / McCown's Longspur (Calcarius mccownii) calling, Montana

Bernard Castelein / Snow bunting (Plectrophenax nivalis) male, Zeeland, The Netherlands. November

Andy Rouse / Snow bunting (Plectrophenax nivalis) male in snow. Finland. April.

Tony Heald / Snow bunting (Plectrophenax nivalis) Svalbard, Norway, July.

Tony Heald / Snow bunting (Plectrophenax nivalis) juvenile, Svalbard, Norway, July.

Robin Chittenden / Snow bunting (Plectrophenax nivalis) Norfolk, England, UK, January.

Robin Chittenden / Snow bunting (Plectrophenax nivalis) Norfolk, UK January.

Robin Chittenden / Snow bunting (Plectrophenax nivalis) Norfolk, England, UK. January.

David Tipling / Snow bunting (Plectrophenax nivalis) flying, winter plumaged male Salthouse North Norfolk, England, UK. February.

David Tipling / Snow buntings (Plectrophenax nivalis) Salthouse North Norfolk, England, UK. February.