Glenn Bartley / Willow Ptarmigan (Lagopus lagopus) male, Manitoba, Canada

Markus Varesvuo,Markus Varesvuo / Willow grouse (Lagopus lagopus) in winter plumage, Utsjoki, Finland, April.

Ben Hall,Ben Hall / Red grouse (Lagopus lagopus scotica) sitting in flowering heather, Peak District, UK, September

Sergey Gorshkov / Willow grouse / ptarmigan (Lagopus lagopus) pair in flight, Agapa River, Taimyr Peninsula, Siberia, Russia

Gerrit Vyn / Willow Ptarmigan (Lagopus lagopus) male standing on snow covered ground, vocalising in spring courtship. Males retain the white body plumage of winter plumage and molt the head and neck feathers to th...

Michael Quinton / Willow Ptarmigan (Lagopus lagopus) with fall plumage perching on branch, Alaska

Michael Quinton / Willow Ptarmigan (Lagopus lagopus) in winter plumage, Alaska

Michael Quinton / Willow Ptarmigan (Lagopus lagopus) with camouflaged winter plumage in snow burrow, Alaska

Mike Read / Red grouse (Lagopus lagopus scoticus) female feeding on heather moorland, near Lochindorb, Highland Region, Scotland, UK, May.

Staffan Widstrand / Willow ptarmigan (Lagopus lagopus) Boreal Taiga forests, Ovre Pasvik National Park, Norway

Graham Eaton / Red grouse (Lagopus lagopus) male on heather moorland, Askrigg, Yorkshire Dales National Park, Yorkshire, UK, January.

Andy Rouse / Red Grouse, (Lagopus lagopus), on wall, Yorkshire, UK