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

The "Frankenstein bunnies" have been making waves across social media in the U.S. Recently, one rabbit potentially carrying the virus was spotted in a Seattle neighborhood.

The growths are most likely caused by a summertime virus common in some U.S. states, but wildlife officials say there is no risk of transmission to humans or other animals.