Rabbits with 'Tentacles' Emerge in US: Understanding the Papilloma Virus

An unusual sight of wild rabbits bearing black, tentacle-like growths has caused alarm in Fort Collins, Colorado. Wildlife officials have confirmed these protrusions are a symptom of the rabbit papilloma virus, an infection specific to rabbits that causes benign tumors.

The virus, which also affects squirrels, typically appears during the summer months in states like Colorado, South Dakota, Minnesota, Kansas, Iowa, and Texas. While the Colorado cases gained attention in August 2025, similar images have recently circulated on social media, purportedly showing affected rabbits in Wisconsin, Minnesota, and New York. However, state wildlife agencies have not yet officially confirmed new outbreaks outside of Colorado.

Officials emphasize that the rabbit papilloma virus does not pose a threat to humans or other animal species. Despite this, the recurring images and reports prompt vigilance. As the summer insect season approaches, when mosquitoes and ticks that can transmit the virus are most active, state wildlife agencies are expected to provide further updates and guidance.