. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. 372 The Descent of Man. Part II. male of another kind of grouse (Tefrao urophasianus), whilst courting the female, has his " bare yellow oesophagus inflated to " a prodigious size, fully half as large as the body;" and he then utters various grating, deep, hollow tones. With his neck-. 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 oesophagus of the female is
. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. 372 The Descent of Man. Part II. male of another kind of grouse (Tefrao urophasianus), whilst courting the female, has his " bare yellow oesophagus inflated to " a prodigious size, fully half as large as the body;" and he then utters various grating, deep, hollow tones. With his neck-. 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 oesophagus of the female is not in any way 42 Richardson, < FaunaBor. American: Birds/1831, p. 359. Auduboii bid. vol. iv. p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Charles, 1809-1882. London, J. Murray
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