If you find yourself wandering through the Colorado wilderness and you spot a rabbit exhibiting characteristics not traditionally associated with rabbits — horns, specifically — take a deep breath. You haven’t accidentally stumbled into a horror movie;

W ildlife officials in Colorado are fielding calls about unusual sightings of cottontail rabbits with horn-like growths protruding from their faces. This condition, caused by a virus, is startling to see but not dangerous to people or pets.

The cottontail rabbit papillomavirus, which alarmed some Colorado residents, cannot spread to other species and often goes away on its own, according to experts.