Infected Rabbits Sprouting Black Tentacles

Two rabbits sitting on grass near wooden logs

Colorado residents are encountering wild rabbits with grotesque black tentacle-like growths sprouting from their heads, a disturbing sight that has wildlife officials issuing urgent warnings to avoid contact with these infected animals.

Story Snapshot

Cottontail rabbits across Colorado are developing black, horn-like growths caused by Shope papillomavirus
The virus poses no threat to humans but can severely impact domestic rabbits
Wildlife officials advise against handling infected animals and recommend immediate veterinary care for domestic rabbits
The condition has no cure but is generally survivable for wild rabbits

Viral Outbreak Creates Alarming Sightings

Fort Collins residents and communities across Colorado have reported multiple sightings of cottontail rabbits displaying black, tentacle-like protrusions from their heads and mouths. The Shope papillomavirus, also known as cottontail rabbit papillomavirus, causes these wart-like tumors that can elongate into dramatic horn-shaped growths. Colorado Parks and Wildlife confirms the virus is specific to rabbits and poses no direct threat to humans or other wildlife species.

The current surge in reported cases began in early August 2025, with wildlife agencies receiving numerous calls from concerned residents. These grotesque growths, described as resembling “black quills or black toothpicks,” create a shocking visual that has sparked widespread alarm across affected communities.

Disease Mechanism and Transmission Patterns

Dr. Richard Shope first documented this papillomavirus in the 1930s, establishing it as a well-studied DNA virus affecting North American rabbit populations. The virus transmits between rabbits primarily through biting insects that serve as arthropod vectors, making outbreaks more common during warm months when insect activity peaks. Wild cottontail rabbits typically survive the infection, with growths eventually disappearing as their immune systems overcome the virus.

Domestic rabbits face significantly greater risks from this virus, particularly those housed in outdoor enclosures where exposure to infected wild rabbits becomes more likely. University of Missouri veterinary experts warn that domestic rabbits experience more severe disease progression compared to their wild counterparts, making prevention and early detection critical for pet owners.

Public Safety Guidelines and Wildlife Management

Colorado Parks and Wildlife emphasizes that most infected cottontails survive the viral infection without intervention, stating they do not recommend euthanizing rabbits unless growths interfere with the animal’s ability to eat and drink. Wildlife officials stress the importance of leaving infected wild rabbits undisturbed, as human intervention typically proves unnecessary and potentially harmful.

‘Frankenstein’ rabbits with horrifying spikes growing from their heads are invading the US — and experts warn to stay away https://t.co/GHvqBysNi7 pic.twitter.com/htokIKugfC

— New York Post (@nypost) August 13, 2025

Pet rabbit owners should maintain vigilant monitoring for similar symptoms and seek immediate veterinary consultation if growths appear. The virus presents no cure, but proper veterinary care can manage complications and ensure affected domestic rabbits receive appropriate supportive treatment during the infection’s course.