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LONDON — Zookeepers say a group of chimpanzees used branches weakened by a storm to make a ladder and escape from their enclosure at the Belfast Zoo in northern Ireland.

Dean McFaul and Danielle Monaghan filmed the escape attempt Saturday and circulated the videos on social media where they went viral. They showed several primates scaling a wall and perching atop it, with one walking down a path outside the enclosure in Northern Ireland.

Zookeeper Alyn Cairns said trees in the chimps' enclosure had been weakened by recent storms, allowing the animals to break them and fashion a ladder to escape. He told the BBC "they're intelligent primates and know they're not supposed to be out of their enclosure, so got back in themselves."

Two weeks ago a rare red panda escaped from the same zoo when its electric fences failed. The animal was recaptured in the driveway of a nearby house.