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makes it an easy target for predators.Bats are among the fireflies'most common potential predators,and some bats have poor vision,making the flashing signal ineffective.This led the researchers to check whether fireflies had some additional layer of protection against bats. Prof Yossi Yovel explains that the idea for this study came up accidentally,during a study that tracked bats'echolocation. “We were wandering around a tropical(热带的)forest with mi crophones capable of recording bats'high frequencies,when sud- denly,we detected unfamiliar sounds at similar frequencies, coming from fireflies,he recalls."In-depth research using high speed video revealed that the fireflies produce the sound by mov- ing their wings,and that the fireflies themselves can't hear this