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Colorado Rabbits Show Horn-Like Growths Caused by Shope Papilloma Virus

The Shope papillomavirus causes wart-like horn growths on Fort Collins rabbits, spreading via insect bites and direct contact; most rabbits recover as growths resolve in colder months.

  • Photos of rabbits in Colorado with black, horn-like growths around their faces, caused by a virus, have gone viral, with some describing the animals as "Frankenstein-", "zombie-" and "demon-rabbits".
  • The virus that causes the horn-like growths, or papillomas, is harmless to the bunnies unless the growths interfere with eating or other sensitive areas, and will disappear once the rabbits' immune systems fight off the virus.
  • The horn-like growths are thought to be the inspiration for the mythical "jackalope", a horned rabbit referenced in North American folklore.
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In the U.S. state of Colorado, several rabbits have appeared that grow black spines out of their heads. The tentacle-like tips come from a virus that is highly contagious to rabbits. Some animals even die. In the past few days, images of rabbits with strange black growths on their heads have appeared on social networks. These animals are infected with the Cottontail Papillomavirus. "The virus is mostly benign in rabbits," explains Kara Van Hoose…

·Vienna, Austria
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The monstrous appearance of these rabbits infected with papillomavirus fascinates and disgusts Internet users.

·Paris, France
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East Idaho News broke the news in Idaho, United States on Monday, August 11, 2025.
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