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.

The growths are not harmful to humans or pets, but it's recommended to keep a safe distance and avoid handling infected rabbits.

The disease in rabbits also contributed to scientists’ knowledge about the connection between viruses and cancer, such as the human papillomavirus that causes cervical cancer. The virus in rabbits was named after Dr.