Having a mate for dinner

摘要

Among spiders, the female of the spe-cies really is more deadly than the male. Lady arachnids have a well-deserved reputation for polishing off their suitors, post copula, in a manner that Hannibal Lecter might have admired. But it has never been clear why this happens. Some biologists believe it is simply a mixture of female hunger and the availability of a meal that is in no position to run away. Others suspect that the male is actually sacrificing his life for the good of his genes. In other words, his becoming a meal for his paramour somehow helps the offspring of their union. Peng Yu, of Hubei University in China, and his colleagues, decided to try to settle the question.