These birds live on open ground, and feed upon twigs and leaves of shrubs, berries, grasses, and seeds; their flight is quick, strong, and prolonged. They walk and run very nimbly, and often escape from their pursuers by hiding under shrubs or among heather, when much alarmed they take wing, but even then never resort to the woods for shelter. Their eggs, which are numerous, are spotted with dark brown. The young run about as soon as they leave the egg, and follow their mother in search of food. At the approach of winter several families frequently associate together. THE WILLOW PTARMIGAN. The WILLOW PTARMIGAN (_Lagopus albus_) is about fifteen inches long and twenty-four inches and a half broad; its wing measures seven inches and a half, and the tail four inches and a quarter, the female is one inch shorter and narrower than her mate. During the winter the plumage of this beautiful bird is of a dazzling white, except the fourteen outer tail-feathers, which are black, with white roots and edges; the six largest quills have an oval brownish black streak in the outer web. As the pairing season advances, the head and nape become reddish brown, spotted and streaked with black, the feathers on the shoulders, back, and rump, and those in the centre of the tail are black, edged with white, and have lines of reddish brown or yellow over half their surface; the tail-feathers become paler and lose their light edges. The primary quills remain white as in winter, while the secondaries turn brown; the face and throat are usually of unspotted reddish brown; the head, upper breast, and thighs of a reddish hue, dotted and lined with black; the feathers of the middle part of the breast are black, spotted with reddish brown and white, and those of the belly and legs entirely white. The lower tail-covers are black, marked with reddish brown and yellow, and the corners of the mouth are decorated with white spots. The above colours often vary in their shades, and in the course of the summer become much paler. The female is always lighter in hue than her mate, and acquires her summer plumage before the male. When the feathers begin to darken, the comb on the brow becomes higher and of a reddish tint.