A recent census carried out by Herbinger and Lia (unpublished reports 2001) found a significant population of chimpanzees in this park. The census was carried out in April 2001 using four different straight transect lines between 2–4 km long and totalling 12.5 km in length. The census suggested a density of 1.6 chimpanzees per km2 and a total population of around 320 weaned chimpanzees for Mont Péko National Park. The classified forest of Haut Sassandra, which is connected through corridors to Mont Péko might still hold up to 400 chimpanzees (Hoppe-Dominik 1991).