Modern zoos balance conservation education missions with the welfare challenges of keeping wild animals in captivity, with ongoing debate about the legitimacy of this trade-off.
Individual animal welfare in zoos varies enormously by institution and species. Welfare is best for species that can exercise natural behaviours in well-designed enclosures. Animals with large home range requirements, complex social needs, or stereotypic behaviour scores indicate that their welfare needs are not adequately met. Zoo welfare should be audited independently and transparently against the Five Domains model.