Silence as a Defense against Predatory Bats in Two Species of Calling Insects

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Abstract
Males of both the lesser wax moth, Achroia grisella (F.) and the bush katydid, Insara covilleae (Rehn and Habard), call mates with high-frequency sound audible to insectivorous bats. Both insects cease acoustical mate calling when they hear the cries of either an approaching bat or a similar artificially-produced sound. The lesser wax moth sometimes continues to call by producing pheromone, but not sound. Both insects resume acoustical calling either soon after a bat has passed or after the artificial sound is removed.

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