Page:Descent of Man 1875.djvu/388

372 male of another kind of grouse (Tetrao urophasianus), whilst courting the female, has his "bare yellow œsophagus inflated to a prodigious size, fully half as large as the body;" and he then utters various grating, deep, hollow tones. With his neck-

Fig 39.

feathers erect, his wings lowered, and buzzing on the gound [sic], and his long pointed tail spread out like a fan, he displays a variety of grotesque attitudes. The œsophagus of the female is not in any way remarkable.