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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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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To beat their competitors in the fight for females, these tiny frogs have a built-in volume control: an inflatable vocal sac (balloonlike pouch) beneath the mouth. Also, Feng says, video analysis suggests that a double set of vocal sacs contributes to the animals' virtuosity. He and his colleagues have videotaped a frog hopping over to Roborana, pouncing on top of the robot, and swiping at the vocal sac. |
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