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vocal sac

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
vocal sac [′vō·kəl ‚sak]
(vertebrate zoology)
An expansible pocket of skin beneath the chin or behind the jaws of certain frogs; may be inflated to a great volume and serves as a resonator.


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Also on the list is Chile Darwin's frog, whose eggs are held in the male's vocal sac until they hatch into tadpoles; and Europe's Olm, a cave-dwelling blind salamander with transparent skin that hunts by scent and electrosensitivity.
Among Darwin frogs, it is the male who swallows and stores the developing tadpoles in his vocal sac until juvenile frogs emerge.
 
 
 
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