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PITY the friends of a sexually harassed female guppy – they are likely to feel her anger.

Males of the species regularly harass females for sex. of the University of Exeter, UK, has now found that harassed females become more aggressive.

In her lab, female guppies were more likely to chase and nudge other females after exposure to a male (). Darden thinks harassed females of other species may react in the same way.

Female guppies are not ordinarily very aggressive towards each other, says of the University of Sheffield, UK. “I’m surprised they got quite so grumpy.”