Wolves infected with a Toxoplasma gondii are more likely than uninfected animals to lead a pack, according to an analysis of more than 200 North American wolves
https://www.nature.com/articles/s42003-022-04122-0

11 times more likely to to start a new pack, and 46 times more likely to become pack leaders.

T. gondii has now been linked to increased risk-taking in rodents, chimpanzees, hyenas, and now gray wolves.

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