vocal sac


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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.
References in periodicals archive ?
Other behaviors observed during bouts, but not quantified because of infrequent occurrence, included 1) gaping--repeated opening and closing of the mouth in a stationary frog; 2) front leg lifts--raising and lowering of the front leg; 3) sitting up--elevation of the anterior portion of the body and head; and 4) partial inflation of the vocal sac without sound production--this usually occurred after a vocalization, so that the vocal sac was not collapsed completely once a call was finished, or before a vocalization, so that the vocal sac was inflated for a time before a call began.
The vocal sac of lindsayi tends to be bilobed but it is single.
It has yellow flanks with brown spots and a median, subgular vocal sac.
Phrynohyas is one of four genera in the family Hylidae having paired lateral vocal sacs.
Sex was determined by the everted lateral black vocal sacs and conspicuous corneous nuptial pads on the first finger.
The next day seven males called from water; these males moved around the pond with all legs extended and the black lateral vocal sacs inflated.
Also, Feng says, video analysis suggests that a double set of vocal sacs contributes to the animals' virtuosity.
Purgue uncovered the ear phenomenon while investigating a long-standing puzzle about vocal sacs in frogs and toads.
Stanley Rand concluded in 1993, so they dismissed the idea of vocal sacs as resonating cavities.