The male black widow spider is not as stupid as you may think. Famously the female eats the male after sex but it appears the males can detect chemical signals on the female's web that tell them which spiders are hungry & which are well fed & so less likely to eat them. A team from Arizona State University devised a cunning series of experiments to determine that the males were able to distinguish the well fed females from the hungry ones by web smell alone.
Read More at Physorg.com
Posted by Astrojenny
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