Female concave-eared frogs draw mates with ultrasonic calls

Sunday, May 11, 2008 - 13:21 in Biology & Nature

Most female frogs don`t call; most lack or have only rudimentary vocal cords. A typical female selects a mate from a chorus of males and then -silently - signals her beau. But the female concave-eared torrent frog, Odorrana tormota, has a more direct method of declaring her interest: She emits a high-pitched chirp that to the human ear sounds like that of a bird. This is one of several unusual frog-related findings reported this week in the journal Nature.

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