The Gardiner's Seychelles frog, so tiny it fits easily on a fingernail, belts out high-pitched peeps every couple of minutes. While its tiny size and mouse-like squeaks are reason enough to raise eyebrows, researchers at the Centre de Neurosciences Paris-Sud found something even more remarkable. These frogs may be using their mouths to better hear what's going on in their surroundings.
Herpetologists -- those who study amphibians and reptiles -- have known that these frogs lack a middle ear, which, consisting of several bones and muscles, is what enables many animals (and humans) to hear. Renaud Boistel, a researcher at CNPS, said the Gardiner's Seychelles was not the only frog to lack an inner ear.