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USA, Colorado, Mt. Evans. White-tailed ptarmigan bird changing plumage
White-tailed ptarmigan, winter plumage
White-tailed Ptarmigan, Lagopus leucurus, adult female in summer plumage on alpine tundraWhite-tailed Ptarmigan, Lagopus leucura, adult female in summer plumage on alpine tundra, Rocky Mountain National Park, Colorado, USA