Mandrills are the world's largest monkey species, living in complex social groups whose dynamics must be carefully managed in captive environments.
Mandrills in undersized zoo groups cannot express their naturally complex social repertoire including coalition formation, dominance signaling, and multi-level society dynamics. Social instability from inadequate group composition causes chronic stress and aggression. Males displaced from social groups in the wild by rivals can be housed together in bachelor groups, but this requires careful management to prevent escalating competition. Exhibit design must provide sufficient complexity for multiple social subgroups to form without constant visual contact. Staff who can recognize individual mandrill facial expressions and social signals provide better welfare through early detection of social tension.