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Monkeys Find More than One Way to Crack Oysters

Like early Homo sapiens, Burmese long-tailed macaques use stone tools to get to their food. A study published in the journal PLOS One details how the monkeys on a island in southern Thailand use stones and shells to hammer open oysters and shellfish. During eight years of observation, Amanda Tan from Nanyan Technological University in Singapore identified the parts of the tool used (the flat face, the narrow edge or the point) and the ways they were used (hammering with one hand,...

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