Abstract
Abstract. The coefficients of variation for three parameters of the vocalizations of microchiropteran bats were compared to assess the prediction that bat calls would be less variable when the animals were echolocating than when they were communicating with others. The data supported the prediction that echolocation calls were significantly less variable than social calls in lowest frequency and in duration and frequency with maximum energy. The acoustic signals bats produced for their own use were less variable and, arguably, more dependable than the ones they used to communicate with others. While in other situations increased variability may also indicate signal reliability, the bat call data suggested that low levels of signal variation were a useful indication of high signal reliability.
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