The descent of man, and selection in relation to sex . as pricked, and when both were prickedit was altogether stopped. The female has a some- w^hat similar, though smaller, naked space of skin on the neck; but this is not capable of inflation.^^ The 39 Gould, Handbook to the Birds of Australia, vol. i. 1865, p. 308-:-;iO. See also Mr. T. W. Wood in the Student, April, 1870, p. 125. ^^ See remarks to this effect in Goulds Introduction to the Troclii-lidge, 1861, p. 22. ^^ The Sportsman and Naturalist in Canada, by IMajor W. EossKing, 1866, p. 144-146. Mr. T. ^Y. Wood gives in the Student(April
The descent of man, and selection in relation to sex . as pricked, and when both were prickedit was altogether stopped. The female has a some- w^hat similar, though smaller, naked space of skin on the neck; but this is not capable of inflation.^^ The 39 Gould, Handbook to the Birds of Australia, vol. i. 1865, p. 308-:-;iO. See also Mr. T. W. Wood in the Student, April, 1870, p. 125. ^^ See remarks to this effect in Goulds Introduction to the Troclii-lidge, 1861, p. 22. ^^ The Sportsman and Naturalist in Canada, by IMajor W. EossKing, 1866, p. 144-146. Mr. T. ^Y. Wood gives in the Student(April, 1870, p. 116) an excellent account of the attitude and habits fthis bird during its courtship. He states that the ear-tufts or neck-plumes are erected, so that they meet over the crown of the head. Chap. XIII. VOCAL MUSIC. 57 male of another kind of grouse (Tetrao urophasianus),whilst courting the female, has his bare yellow oeso-*• pliagus inflated to a prodigious size, fully half as largeas the body; and he then utters various .Co ! s ^ / i O g o u o eS 58 SEXUAL SELECTION : BIEDS. Part IL deep hollow tones. With his neck-feathers erect, hiswings lowered and buzzing on the ground, and his longpointed tail spread out like a fan, he displays a varietyof grotesque attitudes. The oesophagus of the femaleis not in any way remarkable,^^ It seems now well made out that the great throat-pouch of the European male bustard (Otis tarda), andof at least four other species, does not serve, as wasformerly supposed, to hold water, but is connected withthe utterance during the breeding-season of a peculiarsound resemblinor ock. The bird whilst utterincy thissound throws himself into the most extraordinarv atti-tudes. It is a singular fact that with the males of thesame species the sack is not developed in all the indi-viduals.*^ A crow-like bird inhabitino: South America(CejjJialopterus ornatus, fig. 40) is called the umbrella-bird, from its immense top-knot, formed of bare wh
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