dendragapus obscurus

From The Collaborative International Dictionary of English v.0.48:

Grouse \Grouse\ (grous), n. sing. & pl. [Prob. after the analogy
   of mouse, mice, fr. the earlier grice, OF. griesche meor hen:
   cf. F. piegri[`e]che shrike.] (Zool.)
   Any of the numerous species of gallinaceous birds of the
   family Tetraonid[ae], and subfamily Tetraonin[ae],
   inhabiting Europe, Asia, and North America. They have plump
   bodies, strong, well-feathered legs, and usually mottled
   plumage. The group includes the ptarmigans (Lagopus),
   having feathered feet.
   [1913 Webster]

   Note: Among the European species are the red grouse ({Lagopus
         Scoticus}) and the hazel grouse (Bonasa betulina).
         See Capercaidzie, Ptarmigan, and Heath grouse.
         Among the most important American species are the
         ruffed grouse, or New England partridge ({Bonasa
         umbellus}); the sharp-tailed grouse ({Pedioc[ae]tes
         phasianellus}) of the West; the dusky blue, or pine
         grouse (Dendragapus obscurus) of the Rocky Mountains;
         the Canada grouse, or spruce partridge ({D.
         Canadensis}). See also Prairie hen, and Sage cock.
         The Old World sand grouse (Pterocles, etc.) belong to
         a very different family. See Pterocletes, and {Sand
         [1913 Webster]
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