'Great mystery': Hundreds of sheep have been walking in circles for 12 days straight

Hundreds of sheep in China have been captured walking around in a continuous circle for over 12 days, baffling experts.

CCTV footage from a property in northern China's Inner Mongolia region shows dozens of sheep aimlessly walking around in a near-perfect loop for no apparent reason.

The bizarre behaviour has reportedly been going on for almost two weeks straight.

Watch the eerie footage in the player above.

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The strange sight has left experts scratching their heads, with one possible reason for the animals' movements potentially being due to Listeriosis or Circling Disease.

Circling Disease is a localised infection of the brain stem of ruminants by Listeria monocytogenes, which typically results in a lack of control of movement or paralysis.

However, animals who catch the disease normally die one to two days after symptoms first begin.

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Video has shown almost every sheep in the flock joining in on the loop, while some stragglers remain on the outskirts.

Chinese state-run outlet People's Daily, who claim that the sheep are healthy, said that behaviour is a mystery.

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"The great sheep mystery," a social media post said.

"Hundreds of sheep walk in a circle for over 10 days in N China's Inner Mongolia.

"The sheep are healthy and the reason for the weird behaviour is still a mystery."

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