Chimpanzees are our closest living relatives and have some of the most complex social and cognitive needs of any zoo animal. Meeting those needs is a continuous welfare challenge.
Chimpanzee welfare requires stable, complex social groups with appropriate age-sex composition — a challenging requirement given the species' competitive social dynamics. Introductions between unfamiliar individuals carry significant injury risk. Male coalitions can be lethal without careful management. The retirement of research chimpanzees into sanctuary settings has revealed the extent to which laboratory conditions cause long-term behavioral and psychological damage. Sanctuary care for these individuals requires intensive behavioral rehabilitation and highlights the welfare cost of decades of biomedical research use.