Tree frogs can be very small, but very loud. How can they tolerate making such loud sounds?
We hear sound because sound waves cause a difference between the pressure outside the eardrum and on the inside of the eardrum. The ears of a frog are attached to its lungs. When the frog is not singing, it hears very well, but when it is singing, the lungs vibrate along with the ears. The pressure from the lungs somewhat equalizes the pressure of the sound waves, greatly reducing the vibration of the eardrum. This lets the frog hear other things very well, but not be deafened by its own voice.