The withdrawal method is known as a risky way to avoid pregnancy, but for one species of spider, the ability to make a hasty withdrawal is a matter of life or death.After males of the orb-weaving spider Philoponella prominens mate with a female, they launch themselves away in a split-second catapult action.The aim of this manoeuvre is to avoid being eaten by the female in an act of sexual cannibalism.
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