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![]() ![]() To be sure the mating sounds really did lead bats to their fly meals, the researchers mounted dead (and, as such, noiseless) fly pairs in a typical sex-act position on the shed ceiling. In the study, about 26 percent of fly pairs that were engaged in sex were attacked by bats - and more than half of these were eaten. The mating noise makes the fly pair "visible" to the bats. ![]() When houseflies mate, the female spreads her wings while the male flutters on top of her, a fluttering that probably is responsible for his broadband clicklike sounds.
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