The US effectively ended chimpanzee use in biomedical research in 2015, and the remaining research chimpanzees are being transitioned to sanctuary in a model with implications for all great ape research globally.
Research chimpanzees who spent decades in medical research facilities show lasting psychological damage including post-traumatic stress symptoms, social difficulties, and self-injurious behaviors. Transition to sanctuary requires gradual social reintegration, behavioral rehabilitation, and lifelong veterinary care. The cost of retirement is substantial — approximately 30,000 dollars per chimpanzee per year — and must be funded for the entire remaining lifespan. The US government transition demonstrates that ending great ape research is feasible; the remaining challenge is ensuring adequate sanctuary funding for the decades required.