A video of sheep walking down an impossibly steep cliff is going viral because people are convinced it’s an optical illusion

Conservation biologist Imogene Cancellare posted a video on Twitter of blue sheep walking down a cliff at what looks like an impossibly steep angle. People are convinced it’s an optical illusion with the camera turned sideways. In fact, blue sheep are perfectly capable of scaling cliffs and often use their skills to escape predators. Visit Insider’s homepage for more stories.

It’s a bird! It’s a plane! It’s … a sheep?

A video of gravity-defying blue sheep scaling a cliff in China’s Valley of the Cats has the internet convinced it’s a camera trick. But the species, also known as

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