This illustration shows how a Gardiner's frog can hear with its mouth. Top left: the skin of the animal reflects 99.9 percent of an incoming sound wave, hitting the body close to the inner ear. ... more 
This illustration shows how a Gardiner's frog can hear with its mouth. Top left: the skin of the animal reflects 99.9 percent of an incoming sound wave, hitting the body close to the inner ear. Without a middle ear, sound waves cannot be transp less 
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LiveScience.com | Photo By R. Boistel/CNRS
Tue, Sep 3, 2013 7:25 AM EDT