Once a thriving population, chimpanzees in ivory Coast have experienced a 90 % decline in the last two decades, according to the world wide fund for nature, which estimate the global chimpanzee population is between 150000 and 200000. The last in-depth study, conducted by boesch's organisation in 2008, said ivory coast's chimpanzee population now is between 8000 and 12000. Though no new studies have since been conducted and chimpanzees are difficult to track, boesch said he was convinced the drop has continued