Residents of Fort Collins, Colorado, have reported sightings of wild 'demon' rabbits with black, horn- or tentacle-like growths protruding from their heads and faces, prompting a surge of online discussion and media coverage. The unusual appearance, which began circulating widely on social media in early August 2025, quickly led to speculation about the cause.
Colorado Parks and Wildlife (CPW) has confirmed that the growths are caused by a rabbit-specific virus and are not harmful to humans or pets. Officials advise the public to avoid touching the animals and to report any sightings to local wildlife authorities.
