The prevalence of sexual cannibalism, a behaviour in which the female black widow spider eats the male (usually half the size) after mating, has inspired the common name "widow spiders". However, much of the documented evidence for sexual cannibalism has been observed in laboratory cages where the males could not escape.
Male black widow spiders tend to select their mates by determining if the female has eaten already to avoid being eaten themselves. They are able to tell if the female has fed by sensing chemicals in the web. (source: Wikipedia)
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