Primates are among the most cognitively complex animals in captivity. Their welfare needs are extensive and their capacity for suffering when those needs are unmet is profound.
Primate welfare in captivity requires addressing the full complexity of their social, cognitive, and physical needs. Psychological harm from inadequate housing is visible and well-documented: stereotypic rocking, self-harm, abnormal social behavior, and depression-like withdrawal are all responses to environments that fail to meet the needs of cognitively sophisticated social animals. The rehabilitation of ex-laboratory chimpanzees demonstrates both the depth of harm that poor conditions cause and the remarkable resilience of primates when given appropriate care. Even with the best intentions and resources, captive primate environments struggle to replicate the complexity of wild social life — a fundamental limitation on the ethics of primate captivity.