How do frogs make noise?

January 10, 2018

Usually, the frogs we hear are male. Male frogs have a special body part called a vocal sac, which is a flexible membrane just under and open to the mouth. To make sound, a frog must close both its nostrils and its mouth. It then squeezes air from its lungs, which passes by the larynx (just like our voice box) before going into the vocal sac. The vibrations caused by the air passing the larynx make sound, which then resonates within the vocal sac. Amazing, isn’t it, that something so small can produce such a loud sound?