Reexamining the origins of human fatherhood

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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.

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