Virus in Colorado Causing Bizarre Horn-Like Growths on Rabbits
Residents in Fort Collins, Colorado, have reported sightings of wild rabbits with bizarre horn-like or tentacle-like growths protruding from their heads and mouths—sparking local chatter about a possible “zombie bunny” invasion.
The unsettling appearance is caused by a viral infection known as Shope papillomavirus, or cottontail rabbit papillomavirus. According to AP News, the virus causes wart-like tumors made of keratin—the same protein found in human nails and hair—that can grow into grotesque protrusions around the face and head.
While the rabbits may look like creatures from a horror movie, wildlife officials stress there is no danger to humans or pets. The virus is species-specific and does not spread to people, dogs, or other animals. Still, Colorado Parks and Wildlife (CPW) advises residents to avoid touching the infected animals and to observe them from a distance.
Reports from southeast Fort Collins have become more frequent in recent weeks. Amanda Gilbert, a reporter with 9NEWS in Northern Colorado, was among those who encountered one of the unusual rabbits. Local resident Susan Mansfield described seeing a rabbit with what appeared to be “black quills or black toothpicks” sticking out around its mouth.
MAJOR CONCERN… Rabbits spotted invading parts of the US with weird tentacles sprouting from their heads due to virus…
Colorado officials are warning: “DO NOT TOUCH” pic.twitter.com/mx41MXPY5l
— DramaAlert (@DramaAlert) August 12, 2025
“I thought he would die off during the winter, but he didn’t,” Mansfield said. “He came back a second year, and it grew.”
Another resident described the growth as looking like “a scabbiesh-looking mass” covering the rabbit’s face.
According to CPW, while the virus does spread among rabbits, it is not considered a serious health threat unless tumors obstruct vital areas like the mouth or eyes. The growths are similar to benign tumors and there is currently no known treatment or cure.
Officials continue to monitor the situation and are asking residents to report unusual sightings to help track the spread—but reassure the public that these strange-looking rabbits are more of a curiosity than a cause for panic.
About Post Author
