The unusual ears of the Chinese concave-eared torrent frog led scientists to speculate that their communication strategy might also be unusual. In order to be heard over the rushing hot springs of their habitat in China, these frogs have evolved the ability to make sounds in the ultrasonic range. At around 20 kilohertz, a frequency beyond the limits of human hearing, these frogs expand the group of animals known to communicate by ultrasound.

Although you can't hear an ultrasonic frog, the ones listed on the left are well within human listening abilities. Click on one to hear.

Frogs! A Chorus of Colors created by Clyde Peeling’s Reptiland.

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