The growths are caused by a rare virus named Shope papilloma virus. The virus leads to wart-like skin protrusions on rabbits' heads and faces. The virus spreads between rabbits through insect bites. Several reports have stated that it is not contagious to humans,

Experts and local officials have issued a warning to anyone who encounters a 'zombie rabbit' on their travels. People have been left concerned after spotting the poor bunnies in Fort Collins, Colorado, with strange, gnarled black growths sticking out of their face and neck.

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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.