Cooperation and sociality
Societies comprise aggregations of individuals interacting cooperatively with one another, but it is not immediately clear why such systems are not undermined by free-riders that accept cooperative acts while giving little or nothing in return. There are several ways in which cooperation can emerge and remain stable within societies despite self-interest. Kin selection may help explain much intraspecific cooperation, but it is not the only mechanism, and sometimes cooperation can be maintained by a complex interplay of several types of interaction, including reciprocity, partner choice, and the threat of punishment.
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Sherratt, T, Wilkinson, D.M. (David M.), & Roberts, G. (Gilbert). (2019). Cooperation and sociality. In Encyclopedia of Animal Behavior (pp. 20–25). doi:10.1016/B978-0-12-809633-8.01135-3