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Wild Rabbits Spotted with Strange 'Horn-Like' Growths Sprouting From Their Heads

The cottontail rabbit papilloma virus causes horn-like growths in 10% of wild rabbits, spreading via mosquito and tick bites, with no cure available, Colorado Parks and Wildlife said.

  • Cottontail rabbits with horn-like growths have appeared in Fort Collins, Colorado, causing concern about their health and unusual appearance.
  • The growths result from the cottontail rabbit papilloma virus, spread primarily by insect bites like mosquitoes and ticks during summer months.
  • Colorado Parks and Wildlife officials state the virus creates black nodules or elongated horns mostly on the head, which may impair eating but usually do not seriously harm wild rabbits.
  • Officials advise avoiding contact with infected rabbits, noting no risk to humans, but the virus can infect domestic rabbits outdoors and requires veterinary care there.
  • Most wild rabbits survive the infection as growths recede in colder months, but severe cases can cause starvation if eating is hindered, highlighting monitoring importance.
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Some rabbits have been found in Fort Collins with strange growths on their heads. Colorado Parks and Wildlife says it's a virus.

·Denver, United States
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Coloradoan broke the news in on Wednesday, August 13, 2025.
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