Ismaele Tortella / Three Rock ptarmigan (Lagopus muta) feeding in winter plumage, city of Tromso in the background, northern Norway, March 2019.
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Gerrit Vyn / Greater sage-grouse (Centrocercus urophasianus) male displaying on a lek in snow, Sublette County, Wyoming, USA. April.
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Lynn M Stone / Free-range New Hampshire rooster, by corn pile in snow-covered field. Higganum, Connecticut, USA.
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LYNN M. STONE / Red Dorking domestic chicken hen and cock {Gallus g domesticus} in snow, Iowa, USA.
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LYNN M. STONE / Red Dorking domestic chicken cock and hen {Gallus gallus domesticus} in snow, Iowa, USA.
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Ismaele Tortella / Rock ptarmigan (Lagopus muta) feeding in winter plumage, city of Tromso in the background, northern Norway, March 2019.
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Mike Read / Rock ptarmigan (Lagopus mutus) droppings, Cairngorms National Park, Highland Region, Scotland, UK, May.
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SCOTLAND: The Big Picture / Ptarmigan (Lagopus muta) male standing in front of its boulder field habitat in the Cairngorms National Park, Scotland, UK, March.
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David Woodfall / Ptarmigan (Lagopus mutus) male in snowfield, Cairngorms, Scotland, UK, February.
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SCOTLAND: The Big Picture / Ptarmigan, (Lagopus mutus) , wide view of winter plumage bird perched on rock, Cairngorms, Scotland, UK.February
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Terry Whittaker / Ptarmigan (Lagopus muta) male in flight Langanes peninsula, northeast Iceland. May.
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Terry Whittaker / Male Ptarmigan (Lagopus muta) , Langanes peninsula, northeast Iceland. May.
