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    • Lagopus Leucura
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White-tailed Ptarmigan (Lagopus leucura) hen sitting atop tundra nest. Rocky Mountain National Park, Colorado, USA, June.
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Charlie Summers / White-tailed Ptarmigan (Lagopus leucura) hen sitting atop tundra nest. Rocky Mountain National Park, Colorado, USA, June.
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, Bow Summit, Alberta, Canada
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 in snow foraging, Bow Summit, Alberta, Canada
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
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) group in winter plumage on mountain side, Glacier National Park, Montana
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
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
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
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
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
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) group in winter plumage on mountain side, Glacier National Park, Montana
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, Bow Summit, Alberta, Canada
White-tailed Ptarmigan (Lagopus leucura) in winter plumage in snow, Bow Summit, Alberta, Canada
00455944
Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage in snow, Bow Summit, Alberta, Canada
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) trio in winter plumage, Glacier National Park, Montana
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) tucking bill under wing, Glacier National Park, Montana
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
White-tailed Ptarmigan (Lagopus leucura) in winter plumage on mountain side, Glacier National Park, Montana
00455932
Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage on mountain side, Glacier National Park, Montana
White-tailed Ptarmigan (Lagopus leucura) in winter plumage on mountain side, Glacier National Park, Montana
00455930
Donald M. Jones / White-tailed Ptarmigan (Lagopus leucura) in winter plumage on mountain side, Glacier National Park, Montana