...Once in the newspapers, and the busy streetswere vocal with open denunciation... 
James W. Donovan 「Don't Marry」
...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」
...He little thought that the little black urchins around him, could see, through those vocal crevices, the very secrets of his heart...
Frederick Douglass 「My Bondage and My Freedom」
...The side cartilages constitute the walls of the organof voice and protect the vocal chords...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...It sings chiefly inspring, and its really wonderful vocal powers have made it one of ourbest-known and most-admired songsters...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...Not onlydoes he imitate the notes of birds about him, but he invents allmanner of quips and vocal jugglery...
Neltje Blanchan 「Birds Every Child Should Know」
...Tanagers, as a rule, are notpossessed of much vocal ability, our species ranking high in their familyas songsters, the notes of many species being far less musical...
Frank M. Chapman 「Color Key to North American Birds」
... if cocks were selected for their vocal qualities...
W. H. Hudson 「Birds in Town and Village」
...Its vocal cords are as active as itswings...
Douglas Dewar 「Birds of the Indian Hills」
...This species, like the last-mentioned,does not confine its vocal efforts to the hot weather...
Douglas Dewar 「A Bird Calendar for Northern India」
...The water-birds, being busy at their nests, are of course noisy,but, with the exception of the loud trumpeting of the saruscranes, their vocal efforts are heard only at the jhil...
Douglas Dewar 「A Bird Calendar for Northern India」
...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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