One of the tiniest species of frog is able to hear despite not having eardrums or middle ears, thanks to a resonating cavity in its mouth.
via LiveScience.com http://www.livescience.com/39407-tiny-frog-can-hear-through-its-mouth-video.html
via LiveScience.com http://www.livescience.com/39407-tiny-frog-can-hear-through-its-mouth-video.html
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