Its plumage ranges from nearly white to dark gray-brown; gray birds are most common in North America. It breeds on tundra in Alaska and northern Canada.
Plumage ranges from nearly white to dark gray-brown. In North America, most birds are an intermediate gray.
In North America, it breeds on Arctic tundra and rocky cliffs, hunting mainly ptarmigans and other birds. It also takes mammals such as hares.
An extinction-risk assessment has not been added yet.