Before dawn in the thick rainforest of western Ivory coast, the air was filled with the sounds of male chimpanzees screaming, hooting and banging on trees.
A baby chimpanzee named Dali slowly stretched out his brown, furry arms and clumsily scrambled from a branch 20m high for a breakfast of nuts and insects provided by game rangers. In the next few minutes he would be joined by 15 others who soon clambered off into the depths of Tai National Park.