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Colorado rabbits spotted with scary ‘horns and tentacles’ on their head; experts warn locals of growth virus

Residents in Fort Collins have spotted wild rabbits with ‘scary’ horn-like and tentacle-shaped growths protruding from their heads and faces. 

Published on: Aug 13, 2025 4:31 AM IST
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Residents in Fort Collins and other parts of Colorado have spotted wild rabbits with ‘scary’ horn-like and tentacle-shaped growths protruding from their heads and faces. Photos circulating on social media have startled locals. They show the animals with black, spiny structures resembling toothpicks or quills, sparking alarm and speculation about possible diseases.

Colorado residents have spotted several rabbits with tentacle-like growth (X)
Colorado residents have spotted several rabbits with tentacle-like growth (X)

Wildlife experts revealed that the unsettling condition is caused by Shope papilloma virus, a disease that creates wart-like tumors on rabbits, often around the head, ears, and eyelids. While the growths may look disturbing, officials stressed they do not pose a threat to humans, pets, or other wildlife.

The virus only spreads between rabbits, typically through bites from insects such as mosquitoes and ticks. According to the University of Missouri, the condition is a DNA virus ‘seen most frequently in cottontail rabbits of the Midwest with outbreaks in domestic rabbits’.

Local Sightings and reactions

Fort Collins residents have reported multiple sightings, including one rabbit that returned to a homeowner’s yard for two consecutive years with increasingly severe growths.

Some residents initially feared the animals had plague or another dangerous illness.

Descriptions of the appearance range from ‘black quills’ to a ‘scabby growth’ covering parts of the face.

“I thought he would die off during the winter, but he didn’t,” a local, Susan Mansfield, told NBC local affiliate KUSA.“He came back a second year, and it grew.”

What is Shope Papilloma Virus?

The virus causes benign wart-like tumors, but in some cases, these can become malignant (cancerous). While generally not harmful to the rabbit’s overall health, tumors can create problems if they obstruct the mouth, nose, or eyes.

The disease is relatively common in wild rabbit populations, particularly during warmer months when insect activity is high.

There is no known cure for the virus; surgical removal of tumors is sometimes performed for domestic rabbits.

Colorado Parks and Wildlife is advising residents to keep their distance. The rabbits are not dangerous.

  • Yash Nitish Bajaj
    ABOUT THE AUTHOR
    Yash Nitish Bajaj

    Yash Bajaj is a Chief Content Producer with a strong foundation in US coverage, digital strategy, and audience-focused storytelling. As part of the US Desk at Hindustan Times, he covers a wide range of topics - from American politics to sports (NFL, NBA, derbies, MLB and more). Before joining Hindustan Times, Yash served as Deputy News Editor at Times Now, where he oversaw international coverage and led a team of six. In this role, he significantly expanded global traffic through strategic planning, SEO-driven content execution, and meticulous trend tracking across platforms. He is experienced in managing high-pressure breaking-news shifts, coordinating live coverage, and building newsroom systems that improve speed, accuracy, and reach. Prior to Times Now, Yash held a position at Opoyi, where he headed the Sports and US news team. He developed broad editorial strategies, guided reporters across multiple beats, and played a key role in recruiting and training new talent. His responsibilities also extended to social media management and experimenting with innovative content formats. A passionate NFL fan, Yash is a die-hard supporter of the Cincinnati Bengals and has followed Joe Burrow closely since his college days at LSU. Whether breaking down top players' latest performance, analyzing team performances, or tracking roster moves, he brings the same dedication and sharp storytelling to his sports coverage as he does to American politics and breaking news. When he’s not writing, Yash can often be found watching games or debating the latest NFL storylines with fellow fans. Yash holds a Bachelor of Mass Media (Journalism) from HR College, Mumbai University. His interests extend well beyond the newsroom: he is an enthusiastic explorer of AI tools, a movie buff with an ever-growing watchlist, and someone who enjoys unraveling conspiracy theories for fun.Read More