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

They develop inside his large vocal sac, safely hidden from predators.

From National Geographic

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

One frog only released the mating sounds; the other also inflated a balloon mimicking the movement of a vocal sac.

From The Verge

The researchers found that, when they added background noise, the bats chose the frog with the moving vocal sac 75 percent of the time.

From The Verge

The movement of the vocal sac made them easier to find.

From The Verge