Monkeys have been observed pounding stones and unintentionally forming sharp-edged, tool-like fragments. This deliberate breakage raises questions about the evolution of intentional stone modification. See Letter p.85
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T. Falótico
Notes
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Roche, H. Stones that could cause ripples. Nature 539, 34–35 (2016). https://doi.org/10.1038/nature19484
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DOI: https://doi.org/10.1038/nature19484