Zoo Animal Welfare

Zoo Drill and Mandrill Social Welfare

Drills and mandrills are highly social Old World monkeys whose welfare requires large, stable mixed-sex groups with complex social structures.

Key Facts

Wild mandrill groups can contain hundreds of individuals in multi-male, multi-female troops
Males have distinctive colourful facial markings that signal dominance status
Drills are critically endangered with fewer than 3,000 remaining in the wild
Social complexity requires multiple adult males and females for stable group dynamics
Zoo groups are typically smaller than wild troops, requiring careful management to maintain social stability

Welfare Considerations

Drills and mandrills have evolved for life in large, complex social groups where individual relationships, dominance hierarchies, and coalition formation are central to welfare. Small zoo groups that lack the social complexity of wild troops leave animals with fewer social behavioural opportunities. Larger groups with stable compositions and opportunities for natural social behaviour are the welfare standard.

What You Can Do

Support accredited zoos with large, well-structured drill and mandrill groups
Advocate for conservation breeding programmes that maintain adequate group sizes
Learn about drill and mandrill conservation threats in West and Central Africa
Support habitat protection programmes in drill and mandrill range countries
Oppose keeping these species in facilities that cannot meet their social needs