Wildlife health update from Colorado

Northern Colorado residents report horned rabbit growths linked to a seasonal rabbit virus.

Colorado wild rabbits develop hornlike growths sparking wildlife health alert

Sightings of wild rabbits with hornlike, dark growths have been reported in northern Colorado. Observers describe the features as wartlike and waxy, sometimes resembling horns or tentacles. Officials say the changes are linked to Shope papilloma virus SPV, a virus that commonly affects cottontail rabbits during the summer when rabbit numbers and insect activity are higher. CPW notes about a dozen reports in the past week, but officials think the number of infections is low and that some sightings may involve the same animals.

There is no risk to humans or other animals, CPW says, but people and pets should avoid touching infected rabbits. Domestic rabbits housed outdoors could contract SPV from infected insects or wild rabbits. The agency does not recommend euthanizing wild rabbits, as most infected rabbits stay healthy unless the growths interfere with eating or drinking. If a dead rabbit is found, wearing gloves and handling it only if comfortable is advised.

The episode illustrates how wildlife health issues can capture public attention through unusual animal appearances. The careful, science-based messaging from wildlife officials helps prevent panic while offering practical guidance. The nickname Frankenstein rabbits shows how people translate biology into stories, underscoring the need for clear information to counter sensational takes.

As climate and insect activity shift, patterns like SPV may become more visible at the urban-wildlife edge. This case highlights the importance of balanced risk communication, especially about when to seek help and how to protect pets. It raises questions about how communities monitor wildlife diseases without normalizing fear or ignoring real ecological signals.

Highlights

Ongoing observation will reveal how SPV moves through local rabbit populations this season.