A parasite that can alter animal behavior is changing the habits of infected wolves in Yellowstone, increasing aggression and goading them into taking greater risks.
Wolves infected with behavior-altering parasites are more likely to become pack leaders, or abandon their packs altogether, according to an analysis of more than 200 gray wolves in Yellowstone National Park. The findings add to a growing body of evidence that Toxoplasma gondii, a single-celled parasite, pulls on the puppet strings of its hosts, goading them into pursuing risky behaviors.
"These two life history behaviors represent some of the most important decisions a wolf can make in its lifetime and may have dramatic impacts on gray wolf fitness, distribution" and the overall rate of births and deaths within a population, the scientists reported.
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