Ammon News - Photos of rabbits in Colorado with black, horn-like growths around their faces have gone viral, with some describing the animals as "Frankenstein-", "zombie-" and "demon-rabbits".

Residents in Fort Collins near Denver recently began posting pictures of the cottontail bunnies, causing a stir online.

"This is how the zombie virus starts," posted one Instagram user on a post showing the rabbits.

"We've got freaking zombie rabbits now?!" posted another on YouTube.

So what's going on?

Firstly, the pictures are real - despite some wishing they weren't.

"One time I need this to be AI," wrote one Instagram user on a post showing the horned bunnies.

The rabbits are suffering from a relatively harmless disease called Shope Papilloma Virus, according to Colorado Parks and Wildlife.

Although the wildlife agency is getting calls from people spotting the infected rabbits in Fort Collins, they're not an unusual sight, according to spokesperson Kara Van Hoose.

The disease is mainly found in America's Midwest, according to the University of Missouri, and is more noticeable in the summer, when the fleas and ticks that spread the virus are most active.

The virus can also spread through rabbit-to-rabbit contact but not to other species like humans or dogs and cats, according to Ms Van Hoose.

People are being warned not to touch the infected rabbits, however. Sky news