Primate social group composition in zoos profoundly affects individual welfare, requiring evidence-based management that respects species-specific social ecology.
Primate social welfare is perhaps the most complex management challenge in zoo animal care because the social dynamics are both welfare-critical and extremely variable between species and individuals. Chronic social incompatibility causes welfare harm that is harder to measure than physical injury — elevated stress hormones, reduced reproductive success, and behavioral restriction are less visible than wounds but equally significant. Evidence-based grouping uses behavioral compatibility assessment, gradual introduction protocols, and ongoing monitoring of social interaction quality to maintain groups that provide genuine positive social welfare rather than forced proximity.