...The tops of the stately poplars were often covered with the red-winged black-birds, making all nature vocal with the joyous life and beauty of their wild, warbling notes... 
Frederick Douglass 「My Bondage and My Freedom」
...Yet it is certain that ifall the writers had listened to the jay's vocal performancesfor themselves, they would have given adifferent account...
W. H. Hudson 「Birds and Man」
...Glot' tis, the opening between the vocal cords, or the mouth of the windpipe...
Worrallo Whitney 「A Guide for the Study of Animals」
...The yellow-breasted chat has remarkable vocal ability, but heis not a real musician like the mockingbird, who also likes to havefun with his voice...
Neltje Blanchan 「Birds Every Child Should Know」
...Distress calls are known in several species of Rana and in Leptodactyluspentadactylus; such calls result from the rapid expulsion of air overthe vocal cords and with the mouth open...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Wherever the vocal organs of caged birds permit them to imitate humanspeech they are apt to devote a large part of their labor to this task,paying little attention to other less meaningful sounds...
Nathaniel Southgate Shaler 「Domesticated Animals」
...This was nothing else than a vocal concert performed by all the dogs of the village, and as they amounted to nearly two thousand, the orchestra was a pretty full one...
R.M. Ballantyne 「The Dog Crusoe and his Master」
...The energy and enthusiasm expended in this direction would be much better employed in improving the bird's vocal powers...
W. H. Hudson 「Birds in Town and Village」
..." To say that this warbleremits incessantly four or five high-pitched, not very musical notes,is to give but a poor rendering of his vocal efforts, but it is, Ifear, the best I can do for him...
Douglas Dewar 「Birds of the Indian Hills」
...Its vocal cords are as active as itswings...
Douglas Dewar 「Birds of the Indian Hills」
...Then the otherswould follow, till the solitude was vocal withtheir calls...
John Burroughs 「Bird Stories from Burroughs」
...Opercula: two plates covering the vocal structure ofCicada, beneath...
John. B. Smith 「Explanation of Terms Used in Entomology」
...The only vocal sound that I heard from the Caribou was the grunt orbawling of the fawns on the fall migration, and only during the lastweek of August, when the “big movement” was under way...
Francis Harper 「The Barren Ground Caribou of Keewatin」
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