Humans are Cooperative Breeders! - Evolving Religion? Sarah Hrdy
For a long time, evolutionary studies have been dominated by Western male scientists. Maybe it is not that surprising that their main hypotheses about the specific pathways of our hominid ancestors focussed on competition, hierarchies, warfare, weapon-and-tool-making and hunting. Unfortunately, the most obvious differences between our species and our primate relatives went largely unnoticed: No chimpanzee or orang-utan could entrust her children e.g. to a birthday party or kindergarten in the hands of non-kin others (the biological term being "alloparental care" - childcare beyond mother and father). Their offspring would risk to be attacked and killed. Therefore, other primate mothers tend to carry and shield their offspring for longer stretches of time, which led to extended spans between births wile restricting times of childhood.
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