Mangabeys live in large social groups which include several males. These primates are very facially expressive as well as very vocal. The adult male has a very loud and long-distance call. The adult females of a group also perform loud choruses. The mangabey are also closely related to the baboons
Due to the lack of field studies for the species, the exact number of golden-bellied mangabeys in the wild is unknown. They are considered endangered due to loss of habitat caused by the creation of roads which despoils their natural habitat in the wild.