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In the USA, there are three species: Rock Ptarmigan, Willow Ptarmigan, and White-tailed Ptarmigan.
Ptarmigan.
(Pronounced as if the P was not there)
Yes the white tailed parmigiana are in the alpine tundra
Tar-mi-gan.
The ptarmigan does use camouflage by moulting white, winter plumage to brown spring plumage.