Nope, that isn’t a mustache on the run, it’s actually a hairy little bugger called a puss caterpillar. The larval stage of the puss moth, the puss caterpillar is covered with hair-like bristles called setate. But don’t go petting it! You’ll walk away with a hand full of tiny spines that induce skin irritation—which can spread to the rest of the body. In severe cases, the spines have even caused nausea, headaches, blisters, and labored breathing. That’s what you get for messin’ with the ‘do, brah!