Zoo accreditation systems provide frameworks for welfare assessment, but the quality and rigour of accreditation varies enormously between schemes and countries.
Zoo accreditation and welfare auditing systems vary enormously in their rigour and effectiveness at protecting animal welfare. In the UK, the combination of BIAZA membership standards, local authority licensing inspections, and Secretary of State standards for modern zoos provides a framework that, when well-implemented, delivers meaningful welfare oversight. The inclusion of welfare outcome measures - assessing actual animal welfare states rather than just management inputs - in auditing is an important advance that distinguishes better schemes from those that simply check physical facilities. However, inspection frequency, inspector expertise, and enforcement action when problems are found vary considerably, meaning the protection offered by accreditation is not uniform. Internationally, the gap between well-resourced accredited institutions in high-income countries and poorly regulated facilities in lower-income countries creates a global welfare landscape of extreme variation. Zoos that purchase animals from or transfer animals to poorly regulated facilities contribute to welfare harm regardless of their own accreditation status. Consumer awareness of accreditation quality - choosing BIAZA-accredited institutions over unaccredited attractions - creates market pressure for welfare improvement.