But the new study, which compares chimpanzees to young children, makes de Waal rethink that view.

CNN: Morality: It's not just for humans

The research, published in the Plos One journal, has shed new light on the mental capacities of chimpanzees.

BBC: Monogamy shunned by female chimps

How did a virus that sprang from chimpanzees in Cameroon touch off a new disease first noticed among gay men in Los Angeles and New York City?

NPR: Origin of AIDS Linked to Colonial Practices in Africa

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