Zoo accreditation by bodies including AZA, EAZA and BIAZA provides welfare standards, but the rigour and transparency of these systems varies and independent evaluation is important.
Zoo accreditation provides important baseline welfare assurance but should not be treated as a guarantee of excellent welfare. Accreditation establishes minimum standards that are typically above legal requirements but leave room for significant variation in welfare quality. Visitors and donors seeking to support genuinely high-welfare facilities need to look beyond accreditation to specific welfare outcome data, conservation contributions and the visible quality of animal care. Independent welfare evaluation supplements accreditation with more granular welfare assessment.