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Scientists say that Capuchin monkeys in Brazil have been using stones to crack open the hard shells of cashew nuts for 700 years - that means they were using this method for some 100 generations. Oxford University primate archaeologist Dr Lydia Luncz explains. (Photo: A capuchin monkey cracking a cashew nut in front of rock art in Serra da Capivara National Park, Brazil.) (Credit: Primate Archaeology Research Group)