... “I believe she had,” replied the duke, with careless naivete and a complaisant forgetfulness, of which no words could translate the tone and the vocal expression... 
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...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」
...Whether it is a fine singer or not within the tropics I am unable to say,its vocal powers having received no attention from the naturalists whohave observed it...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...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」
...The vocal sacs are grayish brown, and the iris is adeep bronze color...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Like the Skylark itsings in the air, but its vocal powers are limited and not to be comparedwith those of its famous relative...
Frank M. Chapman 「Color Key to North American Birds」
...Males of the two species can be readily separated by therelative sizes of the tympani, presence or absence of vocal slits, andcolor pattern...
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
...His vocal efforts ran the gamutof the entire scale...
Albert Payson Terhune 「Lad: A Dog」
...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」
... vocal and instrumental; now a long trill--a trilling...
W. H. Hudson 「Birds in Town and Village」
...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」
...Philharmonic societiesare formed, whose exclusive object is to educate Chaffinches, andto organize vocal combats...
Rev. C. A. Johns 「British Birds in their Haunts」
...To display his versatility, he gives adull performance which couples the‘go-back’ of the Guinea fowl with theplaint of the Wood-pewee, two widelydiverse vocal sounds...
Various 「Birds Illustrated by Color Photography [June, 1897]」
...Walk in the woods, and thedry leaves rustle with the whir of their wings,the air is vocal with their cheery call...
John Burroughs 「Bird Stories from Burroughs」
...Opercula: two plates covering the vocal structure ofCicada, beneath...
John. B. Smith 「Explanation of Terms Used in Entomology」
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