Mandrills are the world's largest monkey species and highly social primates requiring complex group structures, large naturalistic enclosures, and cognitive enrichment to thrive in zoo settings.
Mandrill welfare in captivity depends critically on appropriate social housing. These highly social primates evolved to live in large multi-male, multi-female groups with complex hierarchies — small groups or solitary housing causes measurable psychological distress. Aggressive interactions are normal within mandrill social groups, but enclosures must provide sufficient space and escape routes to allow subordinate individuals to avoid dominant animals. Males can inflict serious injuries during social conflicts, requiring careful group management and monitoring. Cognitive enrichment is essential: mandrills are intelligent foragers that require problem-solving opportunities, varied foods, and novel objects to prevent boredom and stereotypy. Exhibit size should allow running and exploration — not just adequate standing room. Mandrills are often maintained in off-exhibit groups larger than those visible to zoo visitors; ensuring welfare standards extend to all individuals in a collection is important.