Viral photos have inspired a plethora of unflattering nicknames, including “Frankenstein bunnies,” “demon rabbits,” and “zombie rabbits.”

Colorado Parks and Wildlife: Scary-looking rabbits were hopping around Fort Collins. These weren’t your standard cute, fluffy bunnies; they had horn-like growths protruding from their faces and bodies.

Wild rabbits with strange black growths on their heads have caused concern among Colorado residents with some referring to them as “Frankenstein” rabbits.