The Bactra Review   Cognition in the Wild
If, however, I may indulge in rank speculation for a moment, I suspect that both our talent for working together, and our propensity to do so, were originally among those adaptations which kept slow, soft, hornless, fangless, clawless social animals from being eaten by everything else on the savannah. Cf. Barbara Ehrenreich, Blood Rites: Origins and and History of the Passions of War (NY: Henry Holt, 1997).