. Birds . Trachea of the Swan. It is by the muscles of the inferior larynx that thoseminute and varied movements of the organs of voiceare produced, which modulate and vary its muscles are, therefore, better developed, and morenumerous in birds of song, than in such as have aharsh or monotonous cry. They are termed the musclesof voice, and vary in number from one pair to five,In a few species they are altogether wanting. 108 ORGANS OP SOXG BIRDS. The thrushes, larks, buntings, finches, warblers,swallows, and all birds of song, have five paii:s ofmuscles of voice. The tube is here u
. Birds . Trachea of the Swan. It is by the muscles of the inferior larynx that thoseminute and varied movements of the organs of voiceare produced, which modulate and vary its muscles are, therefore, better developed, and morenumerous in birds of song, than in such as have aharsh or monotonous cry. They are termed the musclesof voice, and vary in number from one pair to five,In a few species they are altogether wanting. 108 ORGANS OP SOXG BIRDS. The thrushes, larks, buntings, finches, warblers,swallows, and all birds of song, have five paii:s ofmuscles of voice. The tube is here uniform, and very. The Larynx of Song Birds. A. B. The inferior larynx; a, b, c, d, e, five pairs of muscles which act onthe larj-nx. C. The upper larjTix; /, /, pair of muscles for opening theglottis; g, g, pair of muscles for dosing the glottis. flexible. The muscle of the tube divides on each sideinto two slips. Each muscle has its appropriate placean d action, by which the modulations and intonations ORGANS OF SONG BIRDS. 109 of the voice of the richest songsters of the grove areproduced. The preceding engraving will render, it isbelieved, the remarks that have been made more represents the laryny ; the upper extremity of thetrachea, the superior opening of which is called theglottis, with the various muscles. Simple is the mechanism which is thus apparent;but who that rightly considers the effects produced,will not perceive the operation of that God who is wonderful in counsel, and excellent in working ? CHAPTER II. VARIOUS SONG BIRDS—THE LINNET—THE BLACKBIRD THE MIS-SEL THRUSH THE SON
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