Beyond reputations and rhetoric, how do the published accreditation standards of the Association of Zoos & Aquariums (AZA) and Zoological Association of America (ZAA) actually compare?

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For years, the Association of Zoos & Aquariums (AZA) and Zoological Association of America (ZAA) have often been portrayed as representing two very different approaches to zoo accreditation.

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But what happens when we put the rhetoric aside and compare their actual accreditation standards?

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We did.

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And the answer is more nuanced—and more revealing—than “one has standards and the other doesn’t.”

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Both AZA and ZAA maintain extensive accreditation requirements. Both address animal welfare, veterinary care, enrichment, conservation, education, emergency preparedness, public safety, ambassador animals, animal records, governance and financial sustainability.

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ZAA’s standards have also evolved. Some distinctions identified in a 2021 side-by-side comparison are no longer accurate today.

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But important differences remain.

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🔎 ANIMAL WELFARE:

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Both organizations require a process for assessing animal welfare.

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AZA goes further by requiring a formal welfare assessment of every animal at least annually, as well as assessments when significant changes or circumstances could affect an animal’s wellbeing.

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🔎 CONSERVATION:

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Both require accredited facilities to participate in conservation.

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ZAA requires participation in and contribution to wildlife conservation programs and monitoring of their impact.

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AZA requires a written conservation strategy with defined and measurable outcomes, demonstrated continuous improvement, measurable field-conservation impact and evaluation of conservation education. Accredited institutions also submit annual conservation and science reports.

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🔎 SCIENTIFIC RESEARCH:

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This remains one of the clearest differences.

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ZAA incorporates current scientific knowledge and encourages scientific work within its standards.

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AZA makes scientific advancement an explicit component of accreditation, including qualified oversight and a formal written research policy governing the evaluation and approval of research.

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🔎 AMBASSADOR ANIMALS & PUBLIC CONTACT

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Here, the story has changed considerably.

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ZAA now requires written ambassador-animal policies addressing welfare, education and conservation messaging, rest periods, program duration, housing and transportation.

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And importantly, ZAA’s current standards prohibit public contact with Class I big cats, including lions, tigers, jaguars, leopards, snow leopards, cheetahs and cougars. ZAA also prohibits accredited facilities from supplying or acquiring baby or juvenile nondomestic animals for “revolving door” encounter/photo businesses involving specified animals.

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AZA has developed an extensive ambassador-animal framework of its own and now goes further with nonhuman primates: since 2024, AZA policy generally excludes all nonhuman primates from ambassador-animal programs, not simply direct-contact encounters.

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🔎 VETERINARY OVERSIGHT:

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Both organizations require professional veterinary care and preventative medicine programs.

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But when an AZA institution uses a consulting or part-time veterinarian, AZA establishes a measurable minimum: the veterinarian must inspect the animals at least twice each month.

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🔎 COLLECTION PLANNING:

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ZAA says facilities “should have or create” an Animal Collection Plan or Master Plan.

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AZA says institutions must follow an Institutional Collection Plan—and requires it to be reevaluated and updated at least every five years.

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🔎 ACCREDITATION INSPECTIONS:

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One similarity deserves particular attention.

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Both organizations operate on a five-year accreditation cycle involving onsite inspection.

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So portraying ZAA accreditation as having no inspection or accreditation process would be inaccurate.

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THE BIGGER PICTURE:

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The most meaningful difference isn’t simply whether standards exist.

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It is how specific, measurable and prescriptive those standards are—and what mechanisms exist to demonstrate compliance.

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Across several important areas, AZA establishes more detailed requirements involving measurable outcomes, scheduled assessments, formal institutional processes, scientific governance and reporting.

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But our review also found something worth acknowledging:

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ZAA has strengthened its standards.

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Policies that might once have supported criticisms involving big-cat public contact, conservation accountability or ambassador-animal practices have changed. Responsible advocacy means recognizing those changes rather than repeating outdated claims.

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That is what evidence-based wildlife advocacy should look like.

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Not choosing the conclusion first and searching for evidence to support it.

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Follow the evidence. Acknowledge progress. Identify the differences. Hold everyone accountable.

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Sources: 2026 AZA Accreditation Standards & Related Policies; 2026 ZAA Accreditation Standards; 2021 ZAA–AZA Accreditation Standards Comparison hosted by the Minnesota House of Representatives.

Related Reading:
What is the Difference Between a Zoo and an Animal Sanctuary?
 

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