vocal sac

British  

noun

1. 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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Example Sentences

Then, with the help of “a secret neck muscle”, Perry releases from under her chin what looks like a frog’s vocal sac.

From The Guardian • Jun. 12, 2017

During breeding, the male’s vocal sac, almost as large as the animal itself, is usually the first thing you will spot.

From New York Times • Apr. 3, 2015

Although Osteocephalus and Argenteohyla have similar vocal sac structure, they are obviously distinct.

From A Synopsis of Neotropical Hylid Frogs, Genus Osteocephalus by Duellman, William E.

The belly is white, and the vocal sac is yellow.

From A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico by Duellman, William E.

The belly and tips of digits were white; the vocal sac was purplish brown, and the iris was dark grayish gold.

From The Amphibians and Reptiles of Michoacán, México by Duellman, William E.