Modern accredited zoos have significantly improved welfare standards while facing ongoing challenges in meeting the needs of wide-ranging and cognitively complex species.
Modern accredited zoos operate within a welfare framework that has improved dramatically over decades, but significant challenges remain for species with large space requirements and high cognitive complexity. Polar bears and elephants in zoos show particularly high rates of stereotypic behaviors indicating inadequate welfare despite improvements - these species' needs may simply be incompatible with zoo housing. The welfare case for holding individual species in zoos must be weighed against conservation and educational benefits on a species-by-species basis. Zoos that prioritize welfare as a genuine goal rather than a compliance checkbox make very different decisions about which species to house.