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Post-reproductive representation (TM/TB) for humans (top) and non-human primates (bottom) under varying circumstances. Primate populations are wild Pan troglodytes and Papio cyanocephalus, semi-wild Macaca fuscata and 66 zoo populations. While both humans and non-humans reveal increasing PrR in increasingly tailored habitats, all human populations experience greater PrR than any non-human population, and no primates but humans experience substantial PrR under natural conditions.
