. The bird, its form and function . different from those of the neck. Theflexible neck enables the bird to reach all parts of itsplumage with its beak, and to pick up food from theground or from twigs overhead, but the all-importantfunction of flight must be provided for by means of a. Fig. 51.—White-thioated Sparrow, three inches tall, with lourteen neck vertebrae. (Compare with Fig. 52.) rigid body-frame. In reptiles and in the embr\^os ofbirds only two pelvic vertebrae are fused together, butin adult birds many dorsal and caudal vertebrae (as manyas 23 in some cases) are fused into a single
. The bird, its form and function . different from those of the neck. Theflexible neck enables the bird to reach all parts of itsplumage with its beak, and to pick up food from theground or from twigs overhead, but the all-importantfunction of flight must be provided for by means of a. Fig. 51.—White-thioated Sparrow, three inches tall, with lourteen neck vertebrae. (Compare with Fig. 52.) rigid body-frame. In reptiles and in the embr\^os ofbirds only two pelvic vertebrae are fused together, butin adult birds many dorsal and caudal vertebrae (as manyas 23 in some cases) are fused into a single bone. Thusthe rib-bearing upper back vertebrae are partially fusedtogether, and below them those of the lower back havemerged until it is difficult to realize that this portion of The Framework of the Bird 7S the skeleton was not originally one bone. Passing on fora moment to the bones of the tail, we find a number ofseparate pieces, ending in a curious-shaped bone, calledthe ploughshare. This is at the tip of the tail, or ^popes
Size: 1695px × 1475px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906
