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The Evolution of Human Social Groups
Humans have only had to grapple with the stresses and complexities of living in large societies for less than eight thousand years what is the evolutionary story of human social groups then? Okay so natural human groups if you like the kind of societies we've lived in for heavens probably the last two million years or so are the kinds of societies we still find in hunter-gatherers all over the world. The advantage of the sort of herding strategy is it's pretty costless in terms of cognition you don't need a big brain to do it because individual relationships are basically anonymous. And that's why this grouping strategy is so common among birds and mammals in general.