Baboons Trade Morning Favors for All-Day Payoffs

Primates basically invented “You scratch my back and I’ll scratch yours.” Baboons, for example, trade grooming for favors from other troop members. Social relationships are important to the monkeys. But it seems they put more effort into certain relationships depending on the time of day: in the morning, lower-ranking baboons invest more energy in grooming animals who can make the rest of their day go smoothly.

Chacma baboons help each other out in several ways, says Claudia Sick, a biologi

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