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"Lagopus albus. Willow Grouse. Willow Ptarmigan. Bill very stout and convex, its depth at base as the distance from nasal fossa to tip; whole culmen 0.75; bill black at all seasons. Male in summer: The head and fore parts rich chestnut or orange-brown, more tawny-brown on back and rump; the richer brown parts sparsely, the tawny-brown more closely, barred with black; most of the wings and under parts remaining white. Female similar, wholly colored excepting the wings, the color more tawny than in the male, and more heavily, closely, and uniformly barred with black." Elliot Coues, 1884

Willow Ptarmigan in Summer

"Lagopus albus. Willow Grouse. Willow Ptarmigan. Bill very stout and convex, its depth at base as the…

"Lagopus albus. Willow Grouse. Willow Ptarmigan. Bill very stout and convex, its depth at base as the distance from nasal fossa to tip; whole culmen 0.75; bill black at all seasons. Male and female in winter: Snow white; 14 tail feathers black, white-tipped; the middle pair (which most resemble and perhaps are true rectrices, having no after-shafts) together with all the coverts, one pair of which reach to end of tail, white; shafts of several outer wing-quills black; no black stripe on head." Elliot Coues, 1884

Willow Ptarmigan in Winter

"Lagopus albus. Willow Grouse. Willow Ptarmigan. Bill very stout and convex, its depth at base as the…