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A parasite might be driving some wolves to lead or go solo.

Wolves in Yellowstone National Park infected with Toxoplasma gondii make more daring decisions than their uninfected counterparts, researchers report November 24 in Communications Biology. The wolves’ enhanced risk-taking means they are more likely to leave their pack, or become leaders of their own.

“Those are two decisions that can really benefit wolves, or could cause wolves to die,” says Connor Meyer, a field biologist at the University of Montana in Missoula. The findings reveal a parasite’s potent ability to influence a wolf’s social fate.

Disease is often considered important for wildlife, mostly in the context of killing its host, Meyer says. “We have evidence now that just being infected with a certain parasite — Toxoplasma — can have pretty major implications for wolf behavior.”
It seems that Yellowstone National Park wolves that are infected with a parasite (Toxoplasma gondii) become risk-takers. This behavior causes the infected wolves to leave the pack, take more risks, and even become pack leaders themselves. This parasite seems to influence a wolf's social fate, and can help create a new leader, and subsequently a new pack, or it could cause the wolf to die. While most diseases in the wild only lead to an animal's death, this particular parasite may help to increase a wolf's standing and social implications. 