1. Ann Gibbons, ‘Food for Thought: Did the First Cooked Meals Help Fuel the Dramatic Evolutionary Expansion of the Human Brain?’, 316:5831 (2007), 1558-1560.
2. Robin Dunber, (Cambridge, Mass.: Harvard Uy Press, 1998).
3. Michael L. Wilson and Richard W. Wrangham, ‘Intergroup Relations in Chimpanzees’, 32 (2003), 363-392; M. McFarland Symington, ‘Fission-Fusion Social anization in and , 11:1 (1990), 49; A. Chapman and Lauren J. Chapman, ‘Determinants of Groups Size in Primates: The Importance of Travel Costs’, in , ed. Sue Boinsky and Paul A. Garber (Chicago: Uy of Chicago Press, 2000), 26.
4. Dunbar, , 69-79; Leslie C. Aiello and R. I. M. Dunbar, ‘Neocortex Size, Group Size, and the Evolution of Language’, 34:2 (1993), 189. For criticism of this approach see: Christopher McCarthy et al., ‘paring Two Methods for Estimatiwork Size’, 60:1 (2001), 32; R. A. Hill and R. I. M. Dunbar, ‘Social work Size in Humans’, 14:1 (2003), 65.
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