Amphibians hear very well- they can even hear sounds which we can’t hear. If you look closely at a frog, you will see small circles covered with a membrane behind its eyes, on the side of its head. This membrane is the frog’s eardrum. Sound waves in the air make the membrane vibrate. The vibrations are transmitted to the inner ear, and from there to the brain, which recognizes it as a sound.
Not all amphibians hear in this way. Burrowing, limbless amphibians pick up vibrations through their lower jaw. Salamanders lack middle and external ears, but have inner ears that can process sound. In some species of salamanders, sound causes the animal’s chest to vibrate, and the vibrations are carried by air from the lungs to the animal’s inner ear.