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[Science Daily] Reexamining the origins of human fatherhood - Science Daily - 2020-06-01
Reexamining the origins of human fatherhood
The origins of paternal care, a key differentiator between humans and other primates, have long been tied to ancestral females trading their own sexual fidelity for food provided by their mates. A new theory developed by economists and anthropologists states that ecological changes, beginning roughly 5-8 million years ago, placed a premium on partnerships -- both between and within sexes -- and fueled the emergence of males who provided food for their offspring.
https://www.sciencedaily.com/releases/2020/04/200428093510.htm