Page:Descent of Man 1875.djvu/388

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372
The Descent of Man.
Part II.

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.
Tetaro culpoldi: male. (T.W. Wood)

feathers erect, his wings lowered, and buzzing on the gound, 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.[1]

  1. Richardson, 'Fauna Bor. American: Birds,' 1831, p. 359. Audubon, ibid. vol. iv. p. 507.