Some 60 primate species, including baboons, chimpanzees and vervet monkeys, express homosexuality, according to a new study that sheds further light on the evolutionary origin of same-sex intimacy.

Conflict between humans and baboons can tear communities apart. Shirley C. Strum has studied wild olive baboons in Kenya for more than 50 years. In that time she's come to understand the species ...

"In the baboon group we studied, the more socially connected, higher-ranking individuals usually walk in the middle of the group, while lower-ranking baboons are often out in front or at the rear.

A chacma baboon and her baby in Cape Town, South Africa. Getty Images Conflict between humans and baboons can tear communities apart. Shirley C. Strum has studied wild olive baboons in Kenya for more ...