What is "hazel grouse"

Hazel \Ha"zel\ (h[=a]"z'l), n. [OE. hasel, AS. h[ae]sel; akin to D. hazelaar, G. hazel, OHG. hasal, hasala, Icel. hasl, Dan & Sw. hassel, L. corylus, for cosylus.]

1. (Bot.) A shrub or small tree of the genus Corylus, as the Corylus avellana, bearing a nut containing a kernel of a mild, farinaceous taste; the filbert. The American species are Corylus Americana, which produces the common hazelnut, and Corylus rostrata. See Filbert.
   --Gray.

2. A miner's name for freestone.
   --Raymond.

   Hazel earth, soil suitable for the hazel; a fertile loam.

   Hazel grouse (Zo["o]l.), a European grouse ( Bonasa betulina), allied to the American ruffed grouse.

   Hazel hoe, a kind of grub hoe.

   Witch hazel. See Witch-hazel, and Hamamelis.

n. A bird in the grouse family, (taxlink Bonasa bonasia species noshow=1)

The hazel grouse, (Tetrastes bonasia) sometimes called the hazel hen, is one of the smaller members of the grouse family of birds. It is a sedentary species, breeding across northern Eurasia as far east as Hokkaido, and as far west as central and eastern Europe, in dense, damp, mixed coniferous woodland, preferably with some spruce.