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The reason for this discrepancy is mainly a consequence of Bateman's principle. Citing wikipedia: Bateman's principle suggests that in most species, variability in reproductive success, or "reproductive variance," is greater in males than in females. This is ultimately a consequent of anisogamy. Females, especially mammalian females, almost always invest ...


To put it in layman's terms, it's the female's job to tend to the young and the male's job to defend their turf. After all, a hen can't ward off an intruder and sit on its eggs at the same time. Or imagine a mother deer leaving its fawn to fight off a wolf pack. The deer would be leaving its young unguarded. Moreover, if the wolves killed the deer, its young ...

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