vocal sac

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Related to vocal sacs: Vocal Pouch

vocal sac

n.
An inflatable pouch on the floor of the mouth cavity of a male frog that amplifies sounds produced by the vocal cords.

vocal sac

n
(Zoology) zoology either of the loose folds of skin on each side of the mouth in many male frogs that can be inflated and act as resonators
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The body length is about 50-60 mm from snout to vent; throat is smooth; vocal sacs are light brown; male has vocal slits under the lower jaw; dorsal side of the body is light grey, olive green or light brown, some times black with numerous scattered small smooth tubercles and irregular black spots; ventrum is white and smooth, immaculate or with dark speckling or reticulation (Khan and Tasnim, 1989).
Also, Feng says, video analysis suggests that a double set of vocal sacs contributes to the animals' virtuosity.--S.M.
Phrynohyas is one of four genera in the family Hylidae having paired lateral vocal sacs. Four species of this genus are currently recognized according to size, structural features, coloration and cranial osteology (Duellman 1971).
Only males have vocal sacs. When one male begins calling, others often join in.