In a demonstration of human-like behaviour monkeys are very selective about the tools they use.
Wild capuchin monkeys were filmed weighing up the correct 'anvil' to use to crack a particular nut. "The detection of such a complex property has not been demonstrated in animal tool use before, as far as I know," said study leader Wing Liu.
"Wild capuchin monkeys are very selective about the best way to crack a nut, according to scientists."
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Source: BBC News
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