A chimpanzee named Vanilla looked in awe, seeing a vast, open blue sky for the first time after living in captivity. The animal protection organization Save The Chimps posted a heartwarming video ...

Since 1977, Tetsuro Matsuzawa has been studying a chimpanzee named Ai ... His staff hit buzzers, and a series of metal gates groaned open, allowing him to enter the booth. Ayumu came right ...