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Why are Colorado rabbits growing tentacles and horns?

The mostly-benign rabbit or shope papilloma virus is caused by biting insects like fleas or ticks, officials say

Rabbit papilloma virus is a mostly benign disease that can impact cottontail rabbits in Colorado bitten by infected fleas or ticks. The virus does not spread to humans or pets and most rabbits clear the virus on their own -- but not before strange wart-like growths pop up on their faces, as shown in this undated photo. (Courtesy of Colorado Parks and Wildlife)
Rabbit papilloma virus is a mostly benign disease that can impact cottontail rabbits in Colorado bitten by infected fleas or ticks. The virus does not spread to humans or pets and most rabbits clear the virus on their own — but not before strange wart-like growths pop up on their faces, as shown in this undated photo. (Courtesy of Colorado Parks and Wildlife)
DENVER, CO - OCTOBER 10: Denver Post reporter Katie Langford. (Photo By Patrick Traylor/The Denver Post)
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Rabbits with tentacles in northern Colorado.

There’s not really a better way to sum up recent photos and headlines about with long, dangling growths on their faces.

But as concerning as they appear, the virus that causes the dark, wart-like growths is relatively common and usually not anything to worry about, Colorado Parks and Wildlife officials said Wednesday.

The growths are caused by , which is spread between cottontail rabbits through direct contact or biting insects such as fleas and ticks, Parks and Wildlife spokesperson Kara Van Hoose said.

Shope papilloma virus can’t spread to humans or other pets, although both should avoid rabbits and other wildlife, Van Hoose said.

State officials have received a handful of reports of the virus since published a photo and story of the odd virus last week, which spread to dozens of other local, national and international news outlets.

The waxy papillomas are mostly made up of keratin and don’t have any negative impact on rabbits unless they interfere with their ability to eat or drink, and most rabbits recover from the virus.

Rabbit papilloma virus can spread to pet rabbits and is more severe in domestic breeds, so pet owners should seek veterinary treatment if their animal gets sick, state officials said.

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