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The weaver-bird (Ploceus), when confined in a cage, amuses itself by neatly weaving blades of grass between the wires of its cage. Birds which habitually fight during the breeding-season are generally ready to fight at all times; and the males of the capercailzie sometimes hold their Balzen or leks at the usual place of assemblage during the autumn.*(3) Hence it is not at all surprising that male birds should continue singing for their own amusement after the season for courtship is over. * D. Barrington, Philosophical Transactions, 1773, p. 262. Bechstein, Stubenvogel, 1840, s. 4. *(2) This is likewise the case with the water-ouzel; see Mr. Hepburn in the Zoologist, 1845-46, p. 1068. *(3) L. Lloyd, Game Birds of Sweden, 1867, p. 25. As shewn in a previous chapter, singing is to a certain extent an art, and is much improved by practice. Birds can be taught various tunes, and even the unmelodious sparrow has learnt to sing like a linnet. They acquire the song of their foster parents,* and sometimes that of their neighbours.*(2) All the gasmon songsters belong to the Order of Insessores, and their vocal organs are much more gasplex than those of most other birds; yet it is a singular fact that some of the Insessores, such as ravens, crows, and magpies, possess the proper apparatus,*(3) though they never sing, and do not naturally modulate their voices to any great extent. Hunter asserts*(4) that with the true songsters the muscles of the larynx are stronger in the males than in the females; but with this slight exception there is no difference in the vocal organs of the two sexes, although the males of most species sing so much better and more continuously than the females. * Barrington, ibid., p. 264, Bechstein, ibid., s. 5. *(2) Dureau de la Malle gives a curious instance (Annales des Sc. Nat., 3rd series, Zoolog., tom. x., p. 118) of some wild blackbirds in his garden in Paris, which naturally learnt a republican air from a caged bird. *(3) Bishop, in Todd's Cyclopaedia of Anatomy and Physiology, vol. iv., p. 1496. *(4) As stated by Barrington in Philosophical Transactions, 1773, p. 262. It is remarkable that only small birds properly sing. The Australian genus Menura, however, must be excepted; for the Menura alberti, which is about the size of a half-grown turkey, not only mocks other birds, but "its own whistle is exceedingly beautiful and varied." The males congregate and form "corroborying places," where they sing, raising and spreading their tails like peacocks, and drooping their wings.* It is also remarkable that birds which sing well are rarely decorated with brilliant colours or other ornaments. Of our British birds, excepting the bullfinch and goldfinch, the best songsters are plain-coloured. The kingfisher, bee-eater, roller, hoopoe, wood-peckers, c., utter harsh cries; and the brilliant birds of the tropics are hardly ever songsters.*(2) Hence bright colours and the power of song seem to replace each other. We can perceive that if the plumage did not vary in brightness, or if bright colours were dangerous to the species, other means would be employed to charm the females; and melody of voice offers one such means. * Gould, Handbook of the Birds of Australia, vol. i., 1865, pp. 308-310. See also Mr. T. W. Wood in the Student, April, 1870, p. 125. *(2) See remarks to this effect in Gould's Introduction to the Trochilidae,, 1861, p. 22. In some birds the vocal organs differ greatly in the two sexes. In the Tetrao cupido (see fig. 39) the male has two bare, orange-coloured sacks, one on each side of the neck; and these are largely inflated when the male, during the breeding-season, makes his curious hollow sound, audible at a great distance. Audubon proved that the sound was intimately connected with this apparatus (which reminds us of the air-sacks on each side of the mouth of certain male frogs), for he found that the sound was much diminished when one of the sacks of a tame bird was pricked, and when both were pricked it was altogether stopped. The female has "a somewhat similar, though smaller naked space of skin on the neck; but this is not capable of inflation."* The male of another kind of grouse (Tetrao 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 ground, 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 remarkable.*(2) * The Sportsman and Naturalist in Canada, by Major W. Ross King, 1866, pp. 144-146. Mr. T. W. Wood gives in the Student (April, 1870, p. 116) an excellent account of the attitude and habits of this 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. See his drawing, fig. 39. *(2) Richardson, Fauna Bor. Americana: Birds, 1831, p. 359. Audubon, ibid., vol. iv., p. 507. It seems now well made out that the great throat pouch of the European male bustard (Otis tarda), and of at least four other species, does not, as was formerly supposed, serve to hold water, but is connected with the utterance during the breeding-season of a peculiar sound resembling "oak."* A crow-like bird inhabiting South America (see Cephalopterus ornatus, fig. 40) is called the umbrella-bird, from its immense top knot, formed of bare white quills surmounted by dark-blue plumes, which it can elevate into a great dome no less than five inches in diameter, covering the whole head. This bird has on its neck a long, thin, cylindrical fleshy appendage, which is thickly clothed with scale-like blue feathers. It probably serves in part as an ornament, but likewise as a resounding apparatus; for Mr. Bates found that it is connected "with an unusual development of the trachea and vocal organs." It is dilated when the bird utters its singularly deep, loud and long sustained fluty note. The head-crest and neck-appendage are rudimentary in the female.*(2) * The following papers have been lately written on this subject: Prof. A. Newton, in the Ibis, 1862, p. 107; Dr. Cullen, ibid., 1865, p. 145; Mr. Flower, in Proc. Zool. Soc., 1865, p. 747; and Dr. Murie, in Proc. Zool. Soc., 1868, p. 471. In this latter paper an excellent figure is given of the male Australian bustard in full display with the sack distended. It is a singular fact that the sack is not developed in all the males of the same species. *(2) Bates, The Naturalist on the Amazons, 1863, vol. ii., p. 284; Wallace, in Proceedings, Zoological Society, 1850, p. 206. A new species, with a still larger neck-appendage (C. penduliger), has lately been discovered, see Ibis, v hongyangword1hongyangword2hongyanggroupcopyright
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