The ruling is the latest twist in a long-running dispute over where dozens of federally-supported former research chimps should live out the remainder of their days.

Two decades of research in Nouabalé-Ndoki Park in the Republic of Congo found the primates foraging alongside each other, wrestling, seeking out their pals — and occasionally making threats.

All chimps managed by the National Institutes of Health that are currently eligible to go to a sanctuary have been moved there, but animal welfare advocates say more should be allowed to go.

Research on bonobos, one of our closest and gentlest relatives, may show how humans evolved to share and cooperate on a massive scale.

Duke anthropologist Brian Hare argues that humans evolved in a way that left us more cooperative and friendlier than our now extinct human cousins, like Neanderthals and Denisovans.

Atlanta-based author and primatologist Frans de Waal has observed animal behavior for 40 years. He's since challenged prevailing scientific notions of...

Atlanta-based author and primatologist Frans de Waal has observed animal behavior for 40 years. He's since challenged prevailing scientific notions of...