and can amplify the sound with a vocal sac that makes sound resonate. Frogs mostly call to attract mates, but they can also make sounds to warn others about their territory, or to express distress ...

The male frog is responsible for caring for the developing offspring. These frogs carry the tadpoles in their vocal sac (a pouch in the throat) until they are ready to emerge as froglets from ...

When white-lipped frogs call, they make a series of audible chirps about four times per second by inflating and deflating a vocal sac under their jaws. But because they often call with their rear ends ...

Constant exposure to the sounds of a busy road can impact a male European tree frog’s stress levels, immune system, and vocal sac coloration, scientists show. To study the effects of road noise on ...