...Here then are 26 highly vocal species, of whichthe songs, calls, chirps, and various other notes, aredistinctly remembered in 23... 
W. H. Hudson 「Birds and Man」
...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」
...—The frogs that comprise the genus Smilisca arecharacterized by paired subgular vocal sacs, essentially the same as those inTriprion (Duellman and Klaas, 1964)...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...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」
...Elbow deep in the placid waters of the lake floundered another womanalmost as wonderfully attired as the first, and quite as vocal...
Albert Payson Terhune 「Further Adventures of Lad」
..." Some people acquainted with the habits of swans declare that theswan is more vocal when dying than at any other time in its life...
John H. Robinson 「Our Domestic Birds」
... On my second day at the village it happened to be raining--a warm, mizzling rain without wind--ind the nightingales were as vocal as in fine bright weather...
W. H. Hudson 「Birds in Town and Village」
..."We talk and think of birds as essentially musical and mimetic, or at least vocal and noisy creatures; and yet we seem to think that although they have an ear, they have no ears...
John Ruskin 「Love's Meinie」
...The ventral surfaces,including the vocal sac, are white; the iris is golden and flecked withblack...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
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