Chimpanzees and monkeys have entered the Stone Age(bbc.com)
bbc.com
Chimpanzees and monkeys have entered the Stone Age
http://www.bbc.com/earth/story/20150818-chimps-living-in-the-stone-age
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http://www.bbc.com/earth/story/20150818-chimps-living-in-the-stone-age
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