Macaques and other monkeys used in biomedical research face severe welfare challenges from social isolation, invasive procedures, and barren housing, while sanctuary populations provide welfare-positive retirement for research survivors.
Macaque welfare in research is compromised by the fundamental conflict between scientific objectives and the social and psychological needs of highly intelligent animals. Social isolation for experimental control causes depression, stereotypic self-grooming, and self-injurious behaviour. Repeated capture, restraint, and invasive procedures cause cumulative stress. Group housing improves welfare but complicates some experimental designs. The Three Rs framework has delivered genuine improvements but significant welfare deficits persist in facilities prioritising scientific convenience over welfare quality. Retirement to sanctuary remains the gold standard welfare outcome for individual research monkeys.