Evolution and Human Behavior : Ecological dominance, social competition, and coalitionary arms races: Why humans evolved extraordinary intelligence

Given the precondition of competition among kin- and reciprocity-based coalitions (shared with chimpanzees), an autocatalytic social arms race was initiated, which eventually resulted in the unusual collection of traits characteristic of the human species, such as concealed ovulation, extensive biparental care, complex sociality, and an extraordinary collection of cognitive abilities.

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