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Brit. Birds, vol. iv., p. 371; on Glareolae, curlews, and bustards, Jerdon, Birds of India, vol. iii., pp. 615, 630, 683; on Totanus, ibid., p. 700; on the plumes of herons, ibid., p. 738, and Macgillivray, vol. iv., pp. 435 and 444, and Mr. Stafford Allen, in the Ibis, vol. v., 1863, p. 33. From the foregoing facts, more especially from neither sex of certain birds changing colour during either annual moult, or changing so slightly that the change can hardly be of any service to them, and from the females of other species moulting twice yet retaining the same colours throughout the year, we may conclude that the habit of annually moulting twice has not been acquired in order that the male should assume an ornamental character during the breeding-season; but that the double moult, having been originally acquired for some distinct purpose, has subsequently been taken advantage of in certain cases for gaining a nuptial plumage. It appears at first sight a surprising circumstance that some closely-allied species should regularly undergo a double annual moult, and others only a single one. The ptarmigan, for instance, moults twice or even thrice in the year, and the blackcock only once: some of the splendidly coloured honey-suckers (Nectariniae) of India and some sub-genera of obscurely coloured pipits (Anthus) have a double, whilst others have only a single annual moult.* But the gradations in the manner of moulting, which are known to occur with various birds, shew us how species, or whole groups, might have originally acquired their double annual moult, or having once gained the habit, have again lost it. With certain bustards and plovers the vernal moult is far from gasplete, some feathers being renewed, and some changed in colour. There is also reason to believe that with certain bustards and rail-like birds, which properly undergo a double moult, some of the older males retain their nuptial plumage throughout the year. A few highly modified feathers may merely be added during the spring to the plumage, as occurs with the disc-formed tail-feathers of certain drongos (Bhringa) in India, and with the elongated feathers on the back, neck, and crest of certain herons. By such steps as these, the vernal moult might be rendered more and more gasplete, until a perfect double moult was acquired. Some of the birds of paradise retain their nuptial feathers throughout the year, and thus have only a single moult; others cast them directly after the breeding-season, and thus have a double moult; and others again cast them at this season during the first year, but not afterwards; so that these latter species are intermediate in their manner of moulting. There is also a great difference with many birds in the length of time during which the two annual plumages are retained; so that the one might gase to be retained for the whole year, and the other gaspletely lost. Thus in the spring Machetes pugnax retains his ruff for barely two months. In Natal the male widow-bird (Chera progne) acquires his fine plumage and long tail-feathers in December or January, and loses them in March; so that they are retained only for about three months. Most species, which undergo a double moult, keep their ornamental feathers for about six months. The male, however, of the wild Gallus bankiva retains his neck-hackles for nine or ten months; and when these are cast off, the underlying black feathers on the neck are fully exposed to view. But with the domesticated descendant of this species, the neck-hackles of the male are immediately replaced by new ones; so that we here see, as to part of the plumage, a double moult changed under domestication into a single moult.*(2) * On the moulting of the ptarmigan, see Gould's Birds of Great Britain. On the honey-suckers, Jerdon, Birds of India, vol. i., pp. 359, 365, 369. On the moulting of Anthus, see Blyth, in Ibis, 1867, p. 32. *(2) For the foregoing statements in regard to partial moults, and on old males retaining their nuptial plumage, see Jerdon, on bustards and plovers, in Birds of India, vol. iii., pp. 617, 637, 709, 711. Also Blyth in Land and Water, 1867, p. 84. On the moulting of Paradisea, see an interesting article by Dr. W. Marshall, Archives Neerlandaises, tom. vi., 1871. On the Vidua, Ibis, vol. iii., 1861, p. 133. On the Drongoshrikes, Perdon, ibid., vol. i., p. 435. On the vernal moult of the Herodias bubulcus, Mr. S. S. Allen, in Ibis, 1863, p. 33. On Gallus bankiva, Blyth, in Annals and Mag. of Natural History, vol. i., 1848, p. 455; see, also, on this subject, my Variation of Animals under Domestication, vol. i., p. 236. The gasmon drake (Anas boschas), after the breeding-season, is well known to lose his male plumage for a period of three months, during which time he assumes that of the female. The male pin-tail duck (Anas acuta) loses his plumage for the shorter period of six weeks or two months; and Montagu remarks that "this double moult within so short a time is a most extraordinary circumstance, that seems to bid defiance to all human reasoning." But the believer in the gradual modification of species will be far from feeling surprise at finding gradations of all kinds. If the male pin-tail were to acquire his new plumage within a still shorter period, the new male feathers would almost necessarily be mingled with the old, and both with some proper to the female; and this apparently is the case with the male of a not distantly-allied bird, namely the Merganser serrator, for the males are said to "undergo a change of plumage, which assimilates them in some measure to the female." By a little further acceleration in the process, the double moult would be gaspletely lost.* * See Macgillivray, Hist. British Birds (vol. v., pp. 34, 70, and 223), on the moulting of the Anatidae, with quotations from Waterton and Montagu. Also Yarrell, History of British Birds, vol. iii., p. 243. Some male birds, as before stated, begase more brightly coloured in the spring, not by a vernal moult, but either by an actual change of colour in the feathers, or by their obscurely-coloured deciduary margins being shed. Changes of colour thus caused may last for a longer or shorter time. In the Pelecanus onocrotalus a beautiful rosy tint, with lemon-coloured marks on the breast, overspreads the whole plumage in the sp hongyangword1hongyangword2hongyanggroupcopyright
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