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Female flies have found an unorthodox way of turning the heads of their male mates.
After the one-on-one dates, each contestant can choose to invite another that they wish to see.
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But they were turned off by frequencies of 212, 235 or 266Hz - which are characteristic of young males, old females and old males respectively.
The slower wing flash frequency of young females could be a typical trait of reproductively capable females, according to the researchers.