Simple prisoner's dilemma programs do this too. In noisy environments, they evolve to tit for two tats with a minority of tit for tats.
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Still this is one of the extremely rare cases where animal have been observed to enforce a social norm. https://www.amazon.com/Ende-B%C3%B6sen-German-Rolf-Degen-ebook/dp/B004YLRYMI/ref=sr_1_1?s=books&ie=UTF8&qid=1494842269&sr=1-1&keywords=ende+des+b%C3%B6sen …pic.twitter.com/KlhCkxlRJe
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