Sound production
Amphibian eyes are fundamentally similar to their fish ancestors, however, they do require a membrane that can be drawn across the eyeballs to keep the surface clean. However, the mechanisms that fish use to perceive sound using resonances generated in their swimbladder will not work in air, and consequently ear drums have evolved to detect sound waves. With their increasing ability to detect sound waves frogs have also developed the ability to produce sound using the huge swelling of their throats to amplify the sound produced by air blown from their lungs over simple vocal cords. Such sounds are unique to individual frog species and are used during courtship (a prelude to mating) and to recognize frogs of the same species.
With their increasing ability to detect sound waves frogs have also developed the ability to produce sound using the huge swelling of their throats to amplify the sound produced by air blown from their lungs over simple vocal cords.
