We are a herd species in many ways: we feel comfortable in company and like to buy things in packs. This is not irrational – it is a useful heuristic that helps avoid catastrophe. Antelope might be able to find slightly better grass by escaping their herd and wandering off on their own, but a lone one would need to spend a large proportion of its time looking out for predators rather than grazing; even if the grass is slightly worse with the herd, they are able to safely spend most of their time grazing, because the burden of watching for threats is shared by many pairs of eyes rather than
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