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This monkey, a Colombian white-faced capuchin, was seen desperately smashing a sharpened tool rock (used for cracking open walnuts) into the glass walls that kept it in captivity.
Tourist Mr Wang told Daily Mail, "The monkey was sharpening the stone, then it started hitting it on the glass."
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It's unknown was triggered the monkeys distress, besides being in captivity.
Tian Shuliao, Zhengzhou Zoo staff member, told local media: "This monkey is unlike other monkeys. This one knows how to use tools to break walnuts. When we feed walnuts to other monkeys, they only know to bite it. But it had never hit the glass before though. This is the first time. It's toughened glass, so it would never have got out. After it happened, we picked up all the rocks and took away all its 'weapons'."
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Onlookers watched in amazement as the glass shattered from the monkeys sheer force.
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"The monkey scared itself away, but it came back to take another look and even touched it," added tourist Mr Wang.
Zoo officials said the glass will be replaced and they would increase patrols to make sure a situation like this doesn't happen again.
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