A comprehensive analysis of lethal coalitionary aggression in chimpanzees convincingly demonstrates that such aggression is an adaptive behaviour, not one that has emerged in response to human impacts. See Letter p.414
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Silk, J. The evolutionary roots of lethal conflict. Nature 513, 321–322 (2014). https://doi.org/10.1038/513321a
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DOI: https://doi.org/10.1038/513321a
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