Studied gender roles in modern day hunter gatherers (Ache of Paraguay)
Men devote >7 hrs per day to hunting/processing food and maintaining weapons/tools.
Men provide 87% of total diet and 100% of protein/fat requirement for group.
Women spend 2 hrs per day gathering food, 2 hours moving camp, 8 hrs light work, childcare.
Hunter gatherers spend time on activities that lower mortality rate of their children and improve reproductive chances.
Differences in gender role enhance survival of the group.
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