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CROSSBILL (Fr. Bec-croise, Ger. Kreuz...

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Originally appearing in Volume V07, Page 509 of the 1911 Encyclopedia Britannica.
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CROSSBILL (Fr. Bec-croise, Ger. Kreuzschnabel)  , the name given to a genus of birds, belonging to the See also:family Fringillidae, or finches, from the unique peculiarity they possess among the whole class of having the horny sheaths of the See also:bill See also:crossing one another obliquely,' whence the appellation Loxia (XoE6s, obliquus), conferred by See also:Gesner on the See also:group and continued by See also:Linnaeus . At first sight this singular structure appears so like a deformity that writers have not been wanting to See also:account it such,' ignorant of its being a piece of mechanism most beautifully adapted to the habits of the See also:bird, enabling it to See also:extract with the greatest ease, from See also:fir-cones or fleshy fruits, the seeds which See also:form its usual and almost invariable See also:food . Its mode of using this unique See also:instrument seems to have been first described by Townson (Tracts on Nat . Hist., p . 116, See also:London, .1799), but only partially, and it was See also:Yarrell who, in 1829 (Zoo' . Journ., iv. pp . 457-465, pl. xiv. See also:figs . 1-7), explained fully the means whereby the jaws and the muscles which See also:direct their movements become so effective in riving asunder cones or apples, while at the proper moment the See also:scoop-like See also:tongue is instantaneously thrust out and withdrawn, conveying the hitherto protected See also:seed to the bird's mouth . The See also:articulation of the mandible to the quadrate-See also:bone is such as to•allow of a very considerable amount of lateral See also:play, and, by a particular arrangement of the muscles which move the former, it comes to pass that so soon as the bird opens its mouth the point of the mandible is brought immediately opposite to that of the maxilla (which itself is movable vertically), instead of crossing or overlapping it—the usual position when the mouth is closed . The two points thus See also:meeting, the bill is ' This peculiarity is found as an accidental malformation in the crows (Corvidae) and other See also:groups; it is comparable to the monstrosities seen in rabbits and other members of the See also:order Glires, in which the incisor See also:teeth grow to an inordinate length . ' A See also:medieval See also:legend ascribes the conformation of bill and coloration of plumage to a divine recognition of the bird's pity, bestowed on See also:Christ at the crucifixion.inserted between the scales or into the pome, but on opening the mouth still more widely, the lateral See also:motion of the mandible is once more brought to See also:bear with See also:great force to wrench aside the portion of the See also:fruit attacked, and then the See also:action of the tongue completes the operation, which is so rapidly performed as to defy See also:scrutiny, except on very See also:close inspection . Fortunately the birds soon become tame in confinement, and a little See also:patience will enable an attentive observer to satisfy himself as to the See also:process, the result of which at first seems almost as unaccountable as that of a See also:clever See also:conjuring See also:trick .

The See also:

common See also:crossbill of the Palaearctic region (Loxia curvirostra) is about the See also:size of a skylark, but more stoutly built . The See also:young (which on leaving the See also:nest have not the tips of the bill crossed) are of a dull See also:olive See also:colour with indistinct dark stripes on the See also:lower parts, and the quills of the wings and tail dusky . After the first See also:moult the difference between the sexes is shown by the hens inclining to yellowish-See also:green, while the cocks become diversified by See also:orange-yellow and red, their plumage finally deepening into a See also:rich See also:crimson-red, varied in places by a See also:flame-colour . Their glowing hues, are, however, speedily lost by examples which may be kept in confinement, and are replaced by a dull orange, or in some cases by a See also:bright See also:golden-yellow, and specimens have, though rarely, occurred in a See also:wild See also:state exhibiting the same tints . The cause of these changes is at See also:present obscure, if not unknown, and it must be admitted that their sequence has been disputed by some excellent authorities, but the See also:balance of See also:evidence is certainly in favour of the above statement . De-pending mainly for food on the seeds of conifers, the movements of crossbills are irregular beyond those of most birds, and they would seem to rove in any direction and at any See also:season in quest of their See also:staple sustenance . But the pips of apples are also a favourite dainty, and it is recorded by the old chronicler See also:Matthew See also:Paris (Hist . Angl . MS. fol . 252), that in 1251 the orchards of See also:England were ravaged by birds, " pomorum grana, & non aliud de eisdem pomis comedentes," which, from his description, " Habebant autem partes rostri cancellatas, per quas poma quasi forcipi vel cultello dividebant," could be none other but crossbills . See also:Notice of a like visitation in 1593 is recorded, but of See also:late it has become evident that not a See also:year passes without crossbills being observed in some See also:part or other of England, while in certain localities in See also:Scotland they seem to breed annually . The nest is rather rudely constructed, and the eggs, generally four in number, resemble those of the See also:greenfinch, but are larger in size .

This See also:

species ranges throughout the See also:continent of See also:Europe,' and occurs in the islands of the Mediterranean and in the fir-See also:woods of the See also:Atlas . In See also:Asia it would seem to extend to Kamtschatka and See also:Japan, keeping mainly to the See also:forest-tracts . Three other forms of the genus also inhabit the Old See also:World—two of them so closely resembling the common bird that their specific validity has been often questioned . The first of these, of large stature, the See also:parrot-crossbill (L. pityopsittacus), comes occasionally to Great See also:Britain, presumably from Scandinavia, where it is known to breed . The second (L. himalayana), which is a See also:good See also:deal smaller, is only known from the See also:Himalaya Mountains . The third, the two-barred crossbill (L. taenioptera), is very distinct, and its proper See also:home seems to be the most See also:northern forests of the See also:Russian See also:empire, but it has occasionally occurred in western Europe and even in England . The New World has two birds of the genus . The first (L. americana), representing the common See also:British species, but with a smaller bill, and the See also:males easily recognizable by their more See also:scarlet plumage, ranges from the northern limit of coniferous trees to the See also:highlands of See also:Mexico, or even farther . The other (L. leucoptera) is the See also:equivalent of the two-barred crossbill, but smaller . It has twice occurred in England . (A .

End of Article: CROSSBILL (Fr. Bec-croise, Ger. Kreuzschnabel)
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