Reports and sightings of cottontail rabbit papillomavirus have been documented for centuries, but the symptoms have gone viral in a new sense this summer. Photos of wild rabbits with wart-like horns ...

Rabbits with growths that resemble horns or tentacles have been spotted around Colorado, but wildlife officials say humans and their furry friends have little cause for concern. The animals' grotesque ...

Cottontail rabbits in Colorado have been spotted with "wart-like" growths on their faces. But don't worry — they're OK. Why it matters: The viral infection causing the horn-like growth spurts can come ...

It’s not just a bad hare day. A rapidly spreading virus is causing cottontail rabbits to grow black, tentacle-like growths out of their heads, prompting warnings to steer clear of the mutated animals.