Abstract
A free-ranging male olive baboon (P. c. anubis) was observed as he used a small twig to locate, extract, and sort pea-sized stone fragments from a clay matrix prior to chewing and swallowing them. Occurrence of this behavior in a feral cercopithecine monkey, albeit in a single instance, indicates that the capacity for tool-use extends more broadly and deeply into the order Primates than heretofore recognized.
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Oyen, O.J. Tool-use in free-ranging baboons of Nairobi National Park. Primates 20, 595–597 (1979). https://doi.org/10.1007/BF02373442
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DOI: https://doi.org/10.1007/BF02373442