Blog Post Image: In Amazon Wars, Bands of Brothers-in-Law

Men from one Yanomamö village in the Amazon “dance” in a neighboring village to show off their military prowess, weaponry and group cohesion after they were invited to a feast to form a coalition between the two communities. This photo dates from the late 1960s. A new study from the University of Utah and University of Missouri shows how the Yanomamö, whom once gained status by killing, formed “bands of brothers-in-law” alliances between villages rather than fighting in more closely related “bands of brothers” from a single village. Photo Credit: Courtesy of Napoleon Chagnon

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