Toxoplasma gondii [above] infections have the ability to change the behavior of rats and mice, making them drawn to rather than fearful of the scent of cats. This effect is advantageous to the parasite, which will be able to sexually reproduce if its host is eaten by a cat. The infection is almost surgical in its precision, as it does not affect a rat's other fears such as the fear of open spaces or of unfamiliar smelling food.Wikipedia [via Metafilter]
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