toxoplasma infections cause chimpanzees to develop a morbid attraction to leopard urine, their main predator. Uninfected chimps avoid it. Interestingly, infected chips don’t seem attracted to lion or tiger urine, which suggests a specific strain of toxo.
About half the human race has toxo on the brain
There is some evidence that toxoplasma in the brain has effects on human behavior, such as slowed reaction times, reduced long-term concentration, and, of course, liking the smell of cat urine
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