A group of baboons have baffled staff at a Dutch zoo by turning their backs on visitors and huddling together in fear.
The colony at Dierenpark Emmen in the Netherlands have spent days sitting in trees and rocks after they were spooked for an unknown reason.
It is the first time zoologists have seen such behaviour, either in captivity or in the wild.
"The baboons were hysterical," said Wijbren Landman, a spokesman for the zoo. "They were not jumping around but were behaving strangely."
Zookeepers do not know what spooked the baboons. Pic: Emmen Dierenpark The 112 baboons were all born in captivity and live on an island in the zoo, close to the German border.
A possible theory for their unusual behaviour is that a predator wandered into their enclosure, or that they spotted an image of one on a visitor's T-shirt.
Others say the primates may have felt an earthquake or other natural disaster.
"The craziest suggestion was that it was caused by a UFO," Mr Landman added.
"They've been observed to be disconcerted in the wild if they've had a run-in with a predator but not (to have shown) this type of behaviour."
The baboons have gradually become less restless and are back to eating apple wedges from their keeper's bucket.
They are venturing into other areas of their 2,000 square metre enclosure and are fighting and removing fleas from each other again.
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