. Reptiles and birds. A popular account of the various orders; with a description of the habits and economy of the most interesting. . Fig. 44.—Lungs of a Pigeon. ing more or less what may be considered the abdomen. It variesgreatly in different genera; but in all it is more or less four-sided, andconvex externally, forming the basis for the powerful muscles by. Fig. —Wing of Eagle. which the wings are moved. These wings serve as arms by whichthe bird guides itself, ascending or descending, according to theimpulse given them. That the anterior form of birds is modifiedso as to be subservie
. Reptiles and birds. A popular account of the various orders; with a description of the habits and economy of the most interesting. . Fig. 44.—Lungs of a Pigeon. ing more or less what may be considered the abdomen. It variesgreatly in different genera; but in all it is more or less four-sided, andconvex externally, forming the basis for the powerful muscles by. Fig. —Wing of Eagle. which the wings are moved. These wings serve as arms by whichthe bird guides itself, ascending or descending, according to theimpulse given them. That the anterior form of birds is modifiedso as to be subservient to the aerial progression for which theseanimals are intended, says McGillivray, is obvious and intel- ANATOMY OF BIRDS. 169 ligible. Their bodies are oval, with the more powerful musclesplaced on the breast, so that, when the horizontal position isassumed, the centre of gravity comes between the wings, and iskept near the lower part by the weight of the pectoral length and flexibility of the neck enable the bird to make the
Size: 2523px × 990px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectbirds, booksubjectrep
