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Gardiner’s Frog Hears with Mouth
French scientists have solved the mystery of how one of the world’s smallest frogs can croak and hear other amphibians without possessing an eardrum.
Gardiner’s frogs from the Seychelles islands, which are just one centimetre long, were thought to be deaf, but the research revealed they actually hear sounds through their mouths.
Using X-rays, the scientists discovered the frogs’ mouths act as a resonator or amplifier for the frequencies ‘spoken’ by the species.
Here you can see the reduced thickness of the tissue between the mouth and the inner ear and a smaller number of tissue layers between the mouth and the inner ear. Dr Boistel said:’The combination of a mouth cavity and bone conduction allows Gardiner’s frogs to perceive sound effectively without a middle ear.