The golden-bellied mangabey (Cercocebus chrysogaster) is an Endangered Old World monkey found in swampy, humid forests south of the Congo River in the Democratic Republic of the Congo.

[1] A study of wild populations found that they form large, complex social groups which in some ways resemble those of humans:[3] [W]hile individuals form friendships, they also irritate each other by snatching food, accidentally stepping on tails, and insisting on trying to groom newborn infants (which annoys the mom).

[3]When faced with predators such as Gaboon vipers, groups will band together and fight collectively.

[3] Wild golden-bellied mangabeys have been seen consuming and sharing mammalian prey.

)[4] Golden-bellied mangabeys share a habitat with bonobos and a comparison study found that the monkeys travel greater distances within their home range to feed, significantly further than other Cercocebus species.