Description
The Rock Ptarmigan is 34–36 centimetres (13–14 in) long (tail 8 cm) with a wing-span of 54–60 centimetres (21–24 in). It is slighter smaller than the Willow Ptarmigan by about 10%. The male's "song" is a loud croaking.
The Rock Ptarmigan is seasonally camouflaged; its feathers moult from white in winter to brown in spring or summer. The breeding male has greyish upper parts with white wings and under parts. In winter, its plumage becomes completely white except for the black tail. It can be distinguished from the winter Willow Ptarmigan (Willow Ptarmigan in North America) by habitat—the Rock Ptarmigan prefers higher elevations and more barren habitat; it is also smaller with a more delicate bill.
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