How Do Frogs Croak?
If you happen to live near a pond, then you’ve probably wondered about the croaking of frogs. It is only the male frog that croaks, or sings. His throaty song is a mating call to the female frog, they also croak to protect their territory from other male frogs.
Frogs are able to make their croaking noises because they have simple vocal cords that have two slits in the bottom of the mouth.
These slits open into what is called a vocal pouch. When a frog calls, he fills his vocal pouch with air until it puffs out like a balloon. The air is then forced back and forth several times between the lungs and the vocal pouch.
Each time, the air passes over the vocal cords in the frog’s throat and we hear a loud CROAK!
The inflating and deflating vocal pouch makes the sound louder or quieter. That sound changes depending on the kind of frog—there are as many different kinds of croaks as there are frogs!