Mandrills are the world's largest monkeys with highly complex social systems, making their welfare in captivity critically dependent on appropriate group management.
Mandrill welfare is inseparably social. In wild hordes, social rank provides structure, resource access, and behavioural opportunity. In captivity, small group sizes compress the social hierarchy into configurations that cause chronic social tension — subordinate animals with nowhere to disperse face persistent stress from dominant individuals. Large, well-managed mandrill groups in spacious naturalistic enclosures replicate the complexity of wild social structure more closely and show substantially better welfare outcomes: more positive social interaction, lower wounding rates, and more time engaged in natural behaviours. Keeper relationships built through positive reinforcement training allow health monitoring without capture stress — a significant welfare benefit for a species that can be difficult to manage safely.