. The illustrated natural history [microform]. Birds; Natural history; Oiseaux; Sciences naturelles. SKELETON OF THE lUIlD. and Immmins-birrli; and in otl .rs Hat, spoiin-lilvo, soft, ami sensitive, as in tho ducks Tliii movoinont of a 1)ir(rs jaw is not prt'cisoly Hiniilar to that of a nuinimal, owinj,' '.» IIk; manniir in which a cortain litth^ bono, tor»ned fi'oiu its squared shapn the (luadnito Imiuc, is articulated to the hones of tho skull. On reference to the accompanying,' illustration, tliis bono will be seen just at tho junction of the lower jaw with the likull. Passing from tho head
. The illustrated natural history [microform]. Birds; Natural history; Oiseaux; Sciences naturelles. SKELETON OF THE lUIlD. and Immmins-birrli; and in otl .rs Hat, spoiin-lilvo, soft, ami sensitive, as in tho ducks Tliii movoinont of a 1)ir(rs jaw is not prt'cisoly Hiniilar to that of a nuinimal, owinj,' '.» IIk; manniir in which a cortain litth^ bono, tor»ned fi'oiu its squared shapn the (luadnito Imiuc, is articulated to the hones of tho skull. On reference to the accompanying,' illustration, tliis bono will be seen just at tho junction of the lower jaw with the likull. Passing from tho head to tho neck, wo lind a marked distinction from the mammals. In them, tho vertehraj of tho neck are never more than seven in number; the lonj; neck of the giraffe and tho short one of tho elephant being obtained by the prolongation of tho scA^en vertebra) in tho former and their compression in the latter. In the birds, however, there are never less than nine vertebroB in the neck, and in some cases the number is considerably greater ; the swan, for example, possessing no less than twenty-three of these bones. Tho neck is also much longer in tho birds, being in many instances longer than the remainder of the body. The vertebrnc of the neck are extremely llexiblo, as is needful for tho peculiar habits of birds; hut those of the back are immovably connected with each other, and in many cases are even fused together. Tho seven or eight short vertebnc which form tho tail are movable, and are generally terminated Ity a single bone of greater length than any of the others. We now proceed to tlii> breast and body. The ribs are chieily lemarkable for a flat ap])en(lage, which starts from the lower portion of the bone, and is directed backwards, so that it overlaps cacli succeeding rib. The breast bono is placed lower than might be supposed from the external aspect of a bird, and is of very great size. Its substance is much flattened, and it possesses a strong ridge or keel of bone,
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Keywords: ., boo, bookcentury1800, booksubjectbirds, booksubjectnaturalhistory
