The research, published in the Plos One journal, has shed new light on the mental capacities of chimpanzees.
BBC: Monogamy shunned by female chimps
But the new study, which compares chimpanzees to young children, makes de Waal rethink that view.
CNN: Morality: It's not just for humans
Frederick Coulston began using chimpanzees for toxicology tests in the 1940s at Holloman Air Force Base in Alamogordo, New Mexico.
CNN: Laboratory chimps get a new lease on life
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