Rare frog uses ultrasonic sound

A rare Chinese frog has been found to use ultrasonic frequencies to communicate - some signals at a level more than six times the limit of human hearing. The adaption allows the concave-eared torrent frogs to communicate in their particular environment, a mountainous area near Shanghai which includes many loud waterfalls and streams.

Animals that were previously known to use ultrasonic communication include dolphins, whales, bats, and certain small rodents.