By Susan Milius
A small frog species from China is the first amphibian shown to use ultrasonic calls, says an international research team.
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Equipment designed for studying bats picked up high-pitched chirrups in the calls of the concave-eared torrent frog Amolops tormotus, says Albert S. Feng of the University of Illinois at Urbana-Champaign. He and his colleagues also measured nerve activity in the hearing centers of the frog brains in response to ultrasonic tones.