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

Recently, some wild rabbits have been seen in the U.S. with "horn-like" growths spurting from their heads that are caused by a viral infection, according to experts.

Rabbits growing apparent tentacle-like growths out of their heads have been spotted in Colorado, NBC affiliate KUSA in Denver reported