. The bird, its form and function . Fig. 128. Fig. 129. Fig. 128.—Windpipe of Flamingo, extended and contracted, showing delicate mechanism of supporting 129.—Syrinx-drum of Mallard Drake; the windpipe above; the bronchi below leading to the lungs. immediately back of the glottis, and extending through-out its entire length. The membrane which connects theserings is so elastic that a section of trachea can be drawnout until it is twice as long as when contracted. Whenin the latter condition (I have in my hand an inch ofthe windpipe of a flamingo, but the general structure The Breath
. The bird, its form and function . Fig. 128. Fig. 129. Fig. 128.—Windpipe of Flamingo, extended and contracted, showing delicate mechanism of supporting 129.—Syrinx-drum of Mallard Drake; the windpipe above; the bronchi below leading to the lungs. immediately back of the glottis, and extending through-out its entire length. The membrane which connects theserings is so elastic that a section of trachea can be drawnout until it is twice as long as when contracted. Whenin the latter condition (I have in my hand an inch ofthe windpipe of a flamingo, but the general structure The Breath of a Bird 169 is common to all birds) the trachea appears to be com-posed of alternating half-rings, but when elongatedthese are seen to be complete, the illusion being pro-duced by the overlapping of half of each ring by an equalpart of the rings on each side. When the trachea is ex-tended, the only hint of this clever device is a small notchon the sides of every ring. The illustration demonstratesthe working better than any
Size: 1310px × 1907px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirds, bookyear1906
