How do frogs make their calls, or “ribbets”?
In some species, such as Spring Peepers, the lower part of the mouth can become a large resonating vocal sac. When the frog closes its mouth and nostrils, and then forces air from the lungs over the vocal chords, the sac inflates and vibrates like a drum, producing long, loud trills. Other species just produce calls with the vocal chords. Why do frogs call? Frogs and toads make a variety of sounds, depending on the situation. The most common are “advertisement” calls, and “alarm” calls. Frogs and toads advertise their presence either to ward off challengers to their territories, or to attract mates. Alarm calls serve to startle predators. How can I find frogs? Frogs can be very difficult to find. They are usually highly camouflaged, blending into their environment. The easiest time to locate frogs and toads is during the mating season. During this time they are in the water, and calling, so it’s often easier to hear frogs than to see them. Breeding season can vary depending on the frog
