. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 60 SEXUAL SELECTION: BIRDS. I Taut II. same manner and soon appeared. Lastly, the male 11< »)>(' (()>"/»/"/'â trimiental music; for during the breeding-season this bird, as Mr. Swinhoe saw, flrst draws in air and then taps the end of its beak perpendicularly down against a stone or the trunk of a tree, "when the breath being forced down the tubular bill produces the correct ; When the male utte
. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 60 SEXUAL SELECTION: BIRDS. I Taut II. same manner and soon appeared. Lastly, the male 11< »)>(' (()>"/»/"/'â trimiental music; for during the breeding-season this bird, as Mr. Swinhoe saw, flrst draws in air and then taps the end of its beak perpendicularly down against a stone or the trunk of a tree, "when the breath being forced down the tubular bill produces the correct ; When the male utters its cry without striking his beak, the sound is quite ; In the foregoing cases sounds are made by the aid of structures already present and otherwise necessary; but in the following cases certain leathers have been specially modified for the express purpose of producing the sounds. The drumming, or bleating, or neighing, or thundering noise, as expressed by different observers, which is made by the common snipe (Scolopax gcdlinago) must have sur- prised every one who has ever heard it. This bird, during. Fio. tail-feather of Scolopax palllnago (from Proc. Zool. 8oc. 1858). the pairing-season, flies to " perhaps a thousand feet in height," and, after zigzagging about for a time, descends in a curved line, with outspread tail and quivering pinions, 11 For the foregoing several facts see, on Birds of Paradise, Brehm, 4 Thierleben,' Band iii. s. 325. On Grouse, Richardson, 'Fnuna Bor. Americ.: Birds,' pp. 343, 359; Major W. Boss King, 4 The Sports- man in Canada,' 1866, p. 156; Audubon, * American Ornitholog. Biog- raph.' vol. i. p. 216. On the Kalij-pheasant, Jerdon, 'Birds of India,* voL iii. p. 538. On the Weavers, * Livingstone's Expedition to the Zam- besi,' 1865, p. 425. On Woodpeckers, Macgillivray, ' Hist, of British Birds,' voL iii. 1840, pp. 84, 88, 89, 95. On the Hoopoe, Mr. Swin- hoe, in 1 Proc. Zoolog. Soc.' June 23, 1863. On
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