Gerrit Vyn / Adult White-tailed Ptarmigan (Lagopus leucurus) camouflaged in winter plumage. Mount Rainier, Washington, USA
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Gerrit Vyn / White tailed ptarmigan (Lagopus leucurus) female camouflaged amongst lichen encrusted alpine rocks, Autumn plumage, Central Cascades, Washington, USA, September.
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Gerrit Vyn / White tailed ptarmigan (Lagopus leucurus) adult female in autumnal moult, Central Cascades, Washington, USA. September.
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Gerrit Vyn / White tailed ptarmigan (Lagopus leucurus) adult female resting on ground in autumnal moult, Central Cascades, Washington, USA. September.
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Charlie Summers / White-tailed Ptarmigan (Lagopus leucura) hen sitting atop tundra nest. Rocky Mountain National Park, Colorado, USA, June.
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage in snow, Bow Summit, Alberta, Canada
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage in snow foraging, Bow Summit, Alberta, Canada
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) group in winter plumage on mountain side, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage on mountain side, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) group in winter plumage on mountain side, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage in snow, Bow Summit, Alberta, Canada
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Floris van Breugel / White-tailed Ptarmigan (Lagopus leucurus) in snow covered mountainous landscape, Mt. Ritter and Banner Peak, Ansel Adams Wilderness, California, USA, July 2009
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Gerrit Vyn / Adult White-tailed Ptarmigans (Lagopus leucurus) camouflaged in winter plumage. Mount Rainier, Washington, USA
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Gerrit Vyn / Adult White-tailed Ptarmigan (Lagopus leucurus) camouflaged in winter plumage. Mount Rainier, Washington, USA
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Gerrit Vyn / Adult White-tailed Ptarmigan (Lagopus leucurus) in winter plumage. Mount Rainier, Washington, USA
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Gerrit Vyn / Adult White-tailed Ptarmigan (Lagopus leucurus) in winter plumage. Mount Rainier, Washington, USA
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Shattil & Rozinski / White tailed ptarmigan {Lagopus leucurus} winter plumage, USA
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Shattil & Rozinski / White tailed ptarmigan {Lagopus leucurus} winter plumage, USA
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JEFF FOOTT / White tailed ptarmigan {Lagopus leucurus} standing up on rock, Colorado, USA
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Bernard Castelein / White tailed ptarmigan {Lagopus leucurus} Jasper NP, Alberta, Canada
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage in snow, Bow Summit, Alberta, Canada
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) trio in winter plumage, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) tucking bill under wing, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage on mountain side, Glacier National Park, Montana
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Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage on mountain side, Glacier National Park, Montana
