Zoology of the Invertebrate Animals

Cover Zoology of the Invertebrate Animals
Zoology of the Invertebrate Animals
Alexander Macalister
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25.
Organ of voice of the raven. A, front view ; B, side view showing the muscles of vocalisation.
of directly acting on them in respiration, except in the ostrich and apteryx ; but as the sternal and vertebral Voice and Senses of Birds. 6 1 ribs can move on each other, the bony wall of the thorax or chest cavity is susceptible of a large range of motion for breathing.
As, from the activity of their motion, birds require a more perfect system of nutrition for their ultimate tissues and organs t
...han reptiles, their respiratory apparatus is very highly developed, and hence their temperature is higher than that of any other group of animals. 9 An organ of voice is usually developed in the air-passages of birds, most commonly at the point where the windpipe or trachea bifurcates to send an air-tube to each lung (fig. 25). At this spot there is a drum-like cavity or syrinx (g), in which certain tense membranes can be made to vibrate, and can be acted on by muscles (a, ft, c, d, e\ attached to the windpipe.

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