Gerrit Vyn / Adult White-tailed Ptarmigan (Lagopus leucurus) camouflaged in winter plumage. Mount Rainier, Washington, USA
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Connor Stefanison / Two White-tailed ptarmigan (Lagopus leucura) perched on a rock at dusk, Hope, British Columbia, Canada. July.
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Connor Stefanison / White-tailed ptarmigan (Lagopus leucura) hunkered down in snow, Jasper National Park, Alberta, Canada, December
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Connor Stefanison / White-tailed ptarmigan (Lagopus leucura) resting under tree, camouflaged in snow, Jasper National Park, Alberta, Canada, December
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Connor Stefanison / White-tailed ptarmigan (Lagopus leucura) two hunkered down, camouflaged in snow, Jasper National Park, Alberta, Canada, December
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Connor Stefanison / White-tailed ptarmigan (Lagopus leucura) hunkered down, perfectly camouflaged in snow, Jasper National Park, Alberta, Canada, December
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Connor Stefanison / White-tailed ptarmigan (Lagopus leucura) hunkered down, camouflaged in snow, Jasper National Park, Alberta, Canada, December
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Connor Stefanison / White-tailed ptarmigan (Lagopus leucura) hunkered down next to small tree shoots, perfectly camouflaged in snow, Jasper National Park, Alberta, Canada, December
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Connor Stefanison / White-tailed ptarmigan (Lagopus leucura) hunkered down next to small tree shoots, perfectly camouflaged in snow, Jasper National Park, Alberta, Canada, December
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Connor Stefanison / White-tailed ptarmigan (Lagopus leucura) hunkered down, perfectly camouflaged in snow, Jasper National Park, Alberta, Canada, December
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Connor Stefanison / White-tailed ptarmigan (Lagopus leucura) hunkered down, perfectly camouflaged in snow, Jasper National Park, Alberta, Canada, December
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Connor Stefanison / White-tailed ptarmigan (Lagopus leucura) hunkered down, perfectly camouflaged in snow, Jasper National Park, Alberta, Canada, December
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Gerrit Vyn / White-tailed ptarmigan (Lagopus leucurus) two in winter plumage. Mount Rainier, Washington, USA. October.
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Floris van Breugel / White-tailed Ptarmigan (Lagopus leucurus) walking on rocks, High Sierra, California. September.
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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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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
