. A history of British birds . lum becoming green; all the undersurface white; legs flesh-colour. The young birds do notbreed till they are two years old. The markings of the nestling are like those of the pre-ceding species, but the brown is of a darker tone, and thewhite of the under parts is purer. The organ of voice in the Sheld-Duck is distinguishedfrom that of any other genus. The trachea, or windpipe,is about ten inches long, nearly uniform in size throughoutits length, except towards the bottom, where, for about oneinch, it is much smaller. On each side of the bone ofdivarication formi
. A history of British birds . lum becoming green; all the undersurface white; legs flesh-colour. The young birds do notbreed till they are two years old. The markings of the nestling are like those of the pre-ceding species, but the brown is of a darker tone, and thewhite of the under parts is purer. The organ of voice in the Sheld-Duck is distinguishedfrom that of any other genus. The trachea, or windpipe,is about ten inches long, nearly uniform in size throughoutits length, except towards the bottom, where, for about oneinch, it is much smaller. On each side of the bone ofdivarication forming the bottom of the tube, there is aglobular, hollow, bony protuberance; that on the one sidebeing as large again as the one on the other. The bone isthin, and so flexible when in its moist and natural state asreadily to become indented on pressure. The representationgiven below is only a little smaller than the natural tube below each enlargement, going off, one to eachlobe of the lungs, presents nothing 358 AN SERES. ANATIDyE. ANA TIDJi.
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Keywords: ., bookauthorsaun, bookcentury1800, bookdecade1870, booksubjectbirds
