A study finds two species of guenon monkeys in Tanzania have been mating and producing fertile offspring for generations.

The male proboscis monkey’s large nose probably evolved in response to female preference and competition between males.

The approach, which has never before been successfully attempted in primates, could lead to improved animal models for human biology and disease.

A scientist confirms a new species of patas monkey in Ethiopia.

A round-up of recent discoveries in behavior research

Researchers in Africa observe chimpanzees stealing palm wine from villagers’ cups and imbibing the beverage.

The US Department of Agriculture has cited the University of Oklahoma for abusing baboons.

Color vision as we know it resulted from one fortuitous genetic event after another.

Meet the University of Washington's Jay Neitz, who studies the evolution of color vision.

Studying handedness in chimps may shed light on the mysterious trait in humans.