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You start each morning with a half-hour of loud hooting to frighten other gibbons away from your forty acres of forest.
If you're a chimpanzee, you live in a group of fifty individuals. Aché women gather plants and small animals, and care for their children (see How Our Ancestors Lived).
Mammals produce glucocorticoid hormones in stressful situations. In male and female primates, high-status individuals produce minimal glucocorticoid in stressful situations.
Low-status individuals produce too much glucocorticoid. Stress"the fear of fear itself"physically hurts low-status individuals.
If you're a gorilla, you establish your physical dominance over any male you meet.The common belief that men are hardwired to be alone ("go to their caves") after a stressful day and that women are hardwired to talk to a supportive partner is a misconception.The former is the avoidant attachment style and the latter is the secure attachment style.Aché men gamble on bringing home a deer one day in ten, instead of choosing the safety of helping their wives gather food.Gamblingand a man's life in generalis stressful.