The golden-bellied mangabey (Cercocebus chrysogaster) is a social Old World monkey found in swampy, humid forests south of the Congo River in the Democratic Republic of the Congo. It was previously considered a subspecies of the agile mangabey (C. agilis).Little is published about the species and its behaviour has only been studied in captivity. The only known picture of golden-bellied mangabeys in the wild is exposed in this article and a link to video can be found in "External links" below.