Rabbits in Fort Collins, Colorado, have been observed with eerie black growths resembling tentacles or horns, causing alarm among residents. Colorado Parks and Wildlife officials have identified the cause as Shope papillomavirus (SPV), a rabbit-only virus that produces wart-like tumours, particularly around the face and head.

Some cottontail rabbits in Fort Collins, Colorado, have been drawing attention because they have wart-like growths on their faces that look like horns.

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