Wild rabbits in Fort Collins, Colorado, have been spotted with disturbing facial growths resembling black tentacles. These are caused by cottontail papilloma virus (CRPV), a disease that creates warty tumors and inspired the myth of the “jackalope” (a rabbit with antlers).

CRPV isn’t dangerous to humans but spreads among rabbits through mosquitoes and ticks. The tumors can grow so large they impair the rabbit’s ability to eat or see, often leading to starvation.

Colorado Parks and Wildlife warns people not to touch infected rabbits. Pet owners should keep domestic rabbits away from biting insects, as vets can remove tumors if caught early.