Orangutans in captivity require complex cognitive enrichment and appropriate social housing to prevent boredom, stereotypies, and psychological distress.
Captive orangutan welfare is challenged by the extreme intelligence and behavioural complexity of the species. Orangutans in inadequate environments develop stereotypies including rocking, head-weaving, and regurgitation-reingestion — all indicators of severe psychological distress. Cognitive enrichment must be sophisticated to engage orangutan intelligence: problem-solving devices requiring multiple-step solutions, foraging enrichment that requires hours to complete, novel substrates and materials, and opportunities for tool use. Social housing is complex for a semi-solitary species: sub-adult males and females can be group-housed with careful management, but adult males are often incompatible. Individual temperament assessment is essential for social group decisions. Leading zoos including San Diego, Chester, and Singapore Zoo publish enrichment protocols that represent best practice.