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Napoleon Chagnon's title promises a visit to two dangerous tribes: the Yanomamö and the Anthropologists. He provides a disjointed treatment. The larger part of the book takes the form of memoir, a return by Chagnon to the people he studied over the greater part of his career. The later chapters address the academic scandal surrounding Chagnon's work - and his place within the evolving discipline. Chagnon defends himself here - but he does not 'scientifically' study his anthropologist accusers: their violence (as opposed to that of the Yanomamö) is not explained.
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Chagnon's scientific work with the Yanomamö involved careful collection of data over a fairly long horizon -- tempered with some theorizing that gets him into hot water. Perhaps his most controversial claim was that Yanomamö competition (which is to say, violence) was directed at the acquisition of women -- and not of material resources. And violence is celebrated: men who have killed others (known as unokais) secure status and -- Chagnon documents -- have significantly more offspring than their more peaceable neighbors. Chagnon suggests that past human experience was much more brutish than we'd like to imagine. Still in his focus on violence from the perspective of competing (and cooperating) males, he overvalues male agency and neglects to inquire of the female Yanomamö: what is it that they seek?