Vocal sacs amplify the sound and could convey nuances of male quality and sexiness, but can also tip off eavesdropping predators. Females in a few species vocalize too, ...

Frogs call by passing air over their vocal cords, like humans, and can amplify the sound with a vocal sac that makes sound ...

Male bullfrogs also have a vocal sac to help amplify the sound. Stress plays a huge role when it comes to a bullfrog’s impressive screaming skills. The more stressed a bullfrog is, ...

Vocal sacs located near the frog’s throat amplify the sound. When a frog inflates its vocal sac, it looks as if it had just produced a giant bubble from chewing gum.

Males of the South American species incubate their young in their vocal sacs. The London Zoo recently established a breeding colony to save the frog from extinction. By Franz Lidz The folk song ...

Male pale-ventered nurse frogs have a translucent white vocal sac and throat and a white belly, according to the study. Females do not have vocal sacs, but their bellies, chests and throats are a ...

Male pale-ventered nurse frogs have a translucent white vocal sac and throat and a white belly, according to the study. Females do not have vocal sacs, but their bellies, chests and throats are a ...

Male pale-ventered nurse frogs have a translucent white vocal sac and throat and a white belly, according to the study. Females do not have vocal sacs, but their bellies, chests and throats are a ...

Frogs call by passing air over their vocal cords, like humans, and can amplify the sound with a vocal sac that makes sound resonate. Frogs mostly call to attract mates, ...