“ The study team found something startling: “A wolf that is positive for toxo is 11 times more likely to disperse than a wolf that’s negative,” said wildlife biologist Kira Cassidy, a research associate at the Yellowstone Wolf Project and co-lead author of the study. “And then becoming a pack leader was even more of an impact: A wolf that was positive was 46 times more likely to become a pack leader than a wolf that was negative.”

Some pack leaders are born & others are groomed by their parasites!