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Rock ptarmigan - Wikipedia
White-tailed ptarmigan - Wikipedia
Willow ptarmigan - Wikipedia
Ptarmigan | Arctic, Ground-Dwelling, Game Bird | Britannica
Rock Ptarmigan Identification - All About Birds
Ptarmigan - Description, Habitat, Image, Diet, and Interesting Facts
Ptarmigan - The Wildlife Trusts
Ptarmigan - U.S. National Park Service
Ptarmigan Bird Facts | Lagopus Mutus - The RSPB Wildlife Charity
White-tailed Ptarmigan - All About Birds