Why and How to Compare Species
Published online by Cambridge University Press: 28 October 2026
This chapter outlines the cross-species comparative method used to investigate the evolutionary origins of war and peace. It explains how comparing humans with other species – particularly chimpanzees and bonobos – can help identify whether intergroup lethal conflict and peaceful cooperation are ancestral traits inherited from a last common ancestor or evolutionary innovations in the hominin lineage. It also introduces archaeological and ethnographic methods to infer intergroup behaviours in prehistory. By combining approaches from evolutionary biology, archaeology, and ethnography, this chapter establishes an interdisciplinary toolkit for assessing when war and peace first emerged.
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