Yellowstone Gray Wolves

When their microbiome is infected with toxoplasma gondii, a parasite, Yellowstone gray wolves are much more likely to engage in risky behaviors. Mice infected with the same parasite exhibit a similar type of fearlessness and are less likely to avoid cats—to their potential detriment. The mice, not the cat. Estimates are that about 30% of humans have this same parasite in their microbiome. Scientists are researching the possibility that human microbiomes may impact human behavior, too, perhaps also intelligence, empathy, attitudes, and who the individual is attracted to. It’s stuff of science fiction, only it appears that it is may not be fiction.

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