Exploring the Biology of Friendship

Exploring the Biology of Friendship

On the Puerto Rican island of Cayo Santiago, it’s the monkeys, not the humans, who are in charge. Yet this palm-fringed haven — home to about 1,000 rhesus macaques—can feel strangely similar to a weekend watering hole or middle-school cafeteria. Among these gregarious macaques, cliques, best-friend pairs, and social climbers are all much in evidence,…

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