Ismaele Tortella / Three Rock ptarmigan (Lagopus muta) feeding in winter plumage, city of Tromso in the background, northern Norway, March 2019.
01608271
Chris Gomersall / Large flock of Red knot (Calidris canutus) moving at high tide roost, in winter plumage, Snettisham RSPB Reserve, Norfolk, England, UK, September.
01492121
David Pattyn / Black necked grebe (Podiceps nigricollis) portrait of an adult bird in winter plumage. The Netherlands. April 2014
01529664
Markus Varesvuo / Female Black grouse (Tetrao / Lyrurus tetrix) perched in tree covered in snow, Inari Kiilopaa, Finland, January.
01529602
Markus Varesvuo / Willow grouse / Ptarmigan (Lagopus lagopus) fluffed up perched in snow, Inari, Finland, February.
01529556
Markus Varesvuo / Willow grouse (lagopus lagopus) flock in flight in snow, Utsjoki, Finland, October.