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Net food production and mortality: human foragers and chimpanzees. On the left, the vertical axis is net production in calories per day and on the right is the mortality hazard per year, smoothed with a locally weighted 5-yr running average after age 5. Details on all sources and estimation procedures for both human and chimpanzee production and consumption data are in supporting information on the PNAS web site at www.pnas.org and in ref. 23.
