New research suggests the wild macaques of coastal Thailand have employed stone tools to pry open oysters and nuts for several generations. Researchers say this is the first step in finding out how their behavior compares with that of early humans living in similar environments.

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New research suggests the wild macaques of coastal Thailand have employed stone tools to pry open oysters and nuts for several generations. Researchers say this is the first step in finding out how their behavior compares with that of early humans living in similar environments.