Abstract
The frog-eating bat,Trachops cirrhosus (Phyllostomatidae), locates frogs by using the frogs' vocalizations and shows a behavioral response to constant frequencies in the sonic range. The minimum intensity needed to elicit a behavioral response to a constant frequency (i.e. threshold intensity) increased as the frequency decreased from 15 kHz to 5 kHz. This is consistent with audiograms of other bats that have been tested in the sonic range. However, the threshold ofT. cirrhosus decreases with frequencies below 5 kHz, which is unusual among bats so far tested in this frequency range. This decreased threshold coincides with the frequencies which characterize frog calls that the bats use to locate their prey.
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