Rabbits in Fort Collins, Colorado, have been spotted with horn-like growths caused by the Shope papillomavirus. While photos have led to nicknames like "Frankenstein bunnies," the virus is relatively harmless and common, affecting only rabbits. Spread by fleas and ticks, the growths usually disappear as the rabbit's immune system fights off the infection. The virus is not contagious to humans or other animals and has been studied for nearly a century, contributing to understanding the link between viruses and cancer.

Prepared by Olivia Bennett and reviewed by editorial team.