Some cottontail rabbits in Fort Collins, Colorado, have been drawing attention because they have wart-like growths on their faces that look like horns.

Fort Collins residents spot cottontail rabbits with hornlike growths, dubbed "Frankenstein bunnies," caused by Shope papillomavirus, harmless to humans and part of folklore history.

Rumors spread online that rabbits infected with a virus that creates a tentacle-like growth on their faces were "invading" the U.S.