Colorado Parks and Wildlife say rabbits in Fort Collins are infected with rabbit papilloma virus, causing horn- or tentacle-like growths.

As weird and concerning as they appear, the virus that causes the dark, wart-like horns or tentacles to grow on cottontail rabbits is relatively common and usually not anything to worry about, CPW

Shope papillomavirus, a common and naturally occurring virus in wild rabbits that causes wart-like growths which can resemble horns or even tentacles.Though the appearance of these animals is startling,