The scientists said that the monkeys might have learned the skill “by chance.” Their discovery on these monkeys was first made back in 2004, and they came back last March 2017 with cameras to film the monkeys.
These monkeys are the fourth non-human primate to enter this Stone Age, the report said. The Stone Age was discovered by humans 2.5 million years ago.
Watch how cool these monkeys are:
Dun dun dun! InqPOP!/Bea Constantino
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