Contact: Lisa Newbern
Emory Health Sciences
Caption: The study apparatus required that chimpanzees remove a barrier in order for another chimpanzee to simultaneously pull in a tray baited with food. The apparatus was mounted to the outdoor enclosure, allowing the chimpanzees to come and go as they wanted.
Credit: Yerkes National Primate Research Center
Usage Restrictions: None
Related news release: Chimpanzees spontaneously initiate and maintain cooperative behavior