Chimpanzees are our closest living relatives, sharing more than 98 percent of our genetic blueprint. Humans and chimps are also thought to share a common ancestor who lived some four to eight million years ago.
Although chimps and humans are closely related, the apes have suffered much at human hands. These great apes are endangered and still threatened by bushmeat hunters and habitat destruction.
The photograph was captured through a thick pane of glass at Basel Zoo.