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.
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.
The animals returned to their enclosure at the Belfast Zoo after a short time, but not before alarmed visitors came face to face with at least one chimpanzee.
Scientists have spotted chimpanzees routinely sipping palm wine from trees in Guinea. The study supports a theory that our common relatives evolved the ability to digest alcohol millions of years ago.