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Show 190 DOMESTIC PIGEONS. CHAP. VI. species were formerly so thoroughly domesticated as to bre.ed readily when confined. Although it is easy to tame most wild birds experience shows us that it is difficult to get them to breed freely under confinement; although. ~t must be owned :hat this is less difficult with pigeons than w1th most other bmls. During the last two or three hundred years, many birds have been kept in aviaries, but hardly one has been added to our list of thoroughly reclaimed species ; yet on the above doctrine we must admit that in ancient times neaTly a dozen kinds of pigeons, now unknown in the wild state, were thoroughly domesticated. Thirdly.-Most of our domesticated animals have run wild in various parts of the world; but birds, owing apparently to their partial loss of the power of flight, less often than quadrupeds. Nevertheless I have met with accounts showing that the com~on fowl has become feral in South America and perhaps in West Africa, and on several islands : the turkey was at one time almost feral on the banks of the Parana ; and the Guinea-fowl has become perfectly wild at Ascension and in Jamaica. In this latter island the peacock, also, "has become a maroon bird." The common duck wanders from its home and becomes almost wild in Norfolk. Hybrids between the common and musk-duck which have become wild have been shot in North America, Belgium, and near the Caspian Sea. The goose is said to have run wild in La Plata. The common dovecot-pigeon has become wild at Juan Fernandez, Norfolk Island, Ascension, probably at Madeira, on the shores of Scotland, and, as is asserted, on the banks of the Hudson in North America.18 But how different is the case, when we turn 18 With respect to feral pigeons-for Juan l!~crnandez, 8ee Bcrt.ero in' Annul. des So. :tfnt.,' tom. xxi. p. 351. For Norfolk I sland, see Rev. E. S. Dixon in the' Dov cote,' 1 51, p. 14, on the authority of Ml·. Gould. For Ascension I rely on MS. information given me by Mr. Lnyard. For tho bunks of the Hudson, see Blyth in ' Annals of Nat. Hist.,' vol. xx., 1857, p. 511. For Scotland, see Macgillivray, 'British Birds,' vol. i. p. 275; also Thompson's 'Nat. History of Ireland, Birds,' vol. ii. p. 11. For ducks, see Rev. E. S. Dixon, 'Ornamental Poultry,' 1847, p. 122. For the fcml hybrids of tho common and muskducks, see Audubon's ' American Ornithology,' and Sclys - Longcbamp's 'Hybridcs dans la Famillo des Anatidcs.' For tho goose, Isidore Geoffroy St. Hilaire, 'IIi st. Nat. G6n.,' tom. iii. p. 498. For guinea-fowls, see Gosse's 'Naturalist's Sojourn in Jamaica,' p. 124; and his 'Birds of Jamaica.' for fuller particulars. I saw the wild guinea-fowl in Ascension. For the peacock, see 'A W oek at CHAP. VI. TIIEIR PARENTAGE. 191 to the eleven chief domestic races of the pigeon, which are. supposed by some authors to be descended from so many distinct species! no one has ever pretended that any one of these races has been found wild in any quarter of the world ; yet they have been transported to all countries, and some of them must have been carried back to their native homes. On the view that all the races are the product of variation, we can understand why they have not become feral, for the great amount of modification which they have undergone shows how long and how thoroughly they have been domesticated; and this would unfit them for a wild life. Fourtltly.-If it be assumed that the characteristic differences between the various domestic races are due to descent from several aboriginal species, we must conclude t~at man chose for domestication in ancient times, either intentionally or by chance, a most abnormal set of pigeons ; for that species resembling such birds as pouters, fantails, carriers, barbs, shortfaced tumblers, turbits, &c., would be in the highest degree abnormal, as compared with all the existing members of the great pigeon-family, cannot be doubted. Thus we should have to believe that man not only formerly succeeded in thoroughly domesticating several highly abnormal species, but that these same species have since all become extinct, or are at least now unknown. This double accident is so extremely improbable that the assumed existence of so many abnormal species would require to be supported by the strongest evidence. On the other hand, if all the races are descended from G. livia, we can understand, as will hereafter be more fully explained, how any slight deviation in structure which first appeared would continually be augmented by the preservation of the most strongly marked individuals; and as the power of selection would be applied according to man's fancy, and not for the bird's own good, the accumulated amount of deviation would certainly be of an abnormal nature in comparison with the structure of pigeons living in a state of nature. I have already alluded to the remarkable fact, that the cha- Port Royal,' by a competent authority, Mr. R. Hill, p. 42. For the turkey I rely on oral informlLtion; I ascertained that they were not Curassows. With respect to fowls I will give the references in the next chapter. |