Bird species inhabiting the moorlands include red grouse, black grouse, ptarmigan, and the capercaillie. Game meat includes mountain hare, rock ptarmigan, willow grouse and moose. Smaller game includes whitefish, arctic char, arctic hares, and ptarmigan. The birds of these areas include rough-legged buzzard, snowy owl, tundra partridge, and rock ptarmigan. They range in size from the 13-inch white-tailed ptarmigan to the 28-inch sage grouse. They headed west and north, finding only a few ptarmigan, fish and three stray caribou. The rock ptarmigan (') is a medium-sized gamebird in the grouse family. In another case, a peregrine falcon kleptoparasitized a willow ptarmigan from a golden eagle. The willow ptarmigan has a circum-boreal distribution. The birds of those areas include rough-legged buzzard, snowy owl and rock ptarmigan. In the northern part can be found ptarmigan, walrus and Arctic fox. The rock ptarmigan feeds primarily on birch and willow buds and catkins when available. A small minority of male willow ptarmigan are polygynous but most are monogamous. Other reports from Alaska show the willow ptarmigan as secondary prey. The Labrador tundra is also permanent home to ptarmigan.