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The biggest zoos in the world depend on what you count: total land, developed grounds, animals, species, or a combination of factors. There is no single verified worldwide ranking in the available figures. Among Association of Zoos and Aquariums (AZA)-accredited facilities, Toronto Zoo has the largest reported zoo acreage at 710 acres; The Wilds is the largest accredited safari park at more than 9,000 acres; and AZA names Omaha’s Henry Doorly Zoo and Aquarium the biggest overall using a composite measure. Those are different answers to different questions—not one interchangeable list.
The facilities below show how acreage and animal collections can tell very different stories. Their reported figures come from institutional fact sheets and AZA comparisons, so treat animal and species totals as published snapshots, not live counts.
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| Name | What “biggest” means here | Reported area | Reported animal collection |
|---|---|---|---|
| The Wilds | Largest AZA-accredited safari park by acreage | More than 9,000 acres | Not stated in the cited comparison |
| North Carolina Zoo | Largest AZA-accredited natural-habitat zoo by acreage | 2,600 wooded acres; 500 developed | Not stated in the cited comparison |
| Toronto Zoo | Largest AZA-accredited zoo by acreage | 710 acres | About 5,816 animals across 495 species, excluding invertebrates |
| San Diego Zoo Safari Park | Large safari park with expansive savanna habitats | 1,800 acres | More than 3,000 animals and over 293 species |
| Omaha’s Henry Doorly Zoo and Aquarium | AZA’s composite “biggest overall” designation | Over 130 acres | Over 960 species |
| San Diego Zoo | Urban wildlife park with a comparatively compact footprint | 100 acres | More than 12,000 animals and over 680 species and subspecies |
Area and collection figures are reported by the facilities or AZA; categories and counting methods differ. AZA’s comparison is limited to accredited facilities, not every zoo worldwide. “Checked: November 2026.”
Why is there no single biggest zoo in the world?
Because “biggest” can refer to the land a facility owns, the area visitors can explore, the grounds developed for exhibits, the number of animals, the number of species, or a blend of those measures. A safari park with wide-ranging habitats may cover thousands of acres while keeping only part of that land in developed visitor areas. A compact urban zoo can care for more animals or represent more species within a much smaller footprint.
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Even acreage can be difficult to compare. “Total area” might include wooded or natural land that is not an animal exhibit, while “developed” acreage refers to a smaller portion. North Carolina Zoo, for example, is described by AZA as having 2,600 wooded acres, of which 500 are developed. A ranking based on the larger number answers a different question from one based on visitor-accessible grounds.
AZA gives separate category answers rather than one worldwide league table: Toronto Zoo is the largest AZA-accredited zoo by acreage; The Wilds is the largest accredited safari park by acreage; and North Carolina Zoo is the largest accredited natural-habitat zoo by acreage. AZA also calls Omaha’s Henry Doorly Zoo and Aquarium the biggest overall when acreage, species count, and exhibit sizes are considered together. That composite designation is not a claim that Omaha has the most land or the most animals on its own. AZA’s category comparisons are useful precisely because they distinguish the measures.
These comparisons also have a defined scope: AZA-accredited facilities. They should not be presented as independently verified rankings of every zoo in every country. The available figures do not establish a universal worldwide winner under a consistent, audited method.
Which zoo has the most land?
Among the AZA categories in the cited comparison, The Wilds has the greatest reported acreage: more than 9,000 acres as a safari park. For a facility categorized specifically as a zoo, Toronto Zoo leads the AZA acreage comparison at 710 acres. North Carolina Zoo covers 2,600 wooded acres, but only 500 are developed; its distinction is largest AZA-accredited natural-habitat zoo by acreage.
Those numbers should not be sorted into a simple “largest zoos” ranking without preserving the facility type and land definition. The Wilds’ acreage is a safari-park comparison, while Toronto’s is the zoo category. North Carolina’s natural-habitat grounds include a substantial wooded area beyond its developed section. Treating those as equivalent visitor exhibit footprints would be misleading.
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Toronto Zoo’s own fact sheet reports 287 hectares, or 710 acres, and describes seven zoogeographic regions: Africa, the Americas, Australasia, Canadian Domain, Eurasia Wilds, Indo-Malaya, and Tundra Trek. The zoo also reports more than 10 kilometers of walking trails. These details help explain how a large property is organized for a visit: it is arranged by broad regions and requires substantial walking, rather than being one continuous exhibit. Its factsheet’s acreage and collection totals are published figures; the document does not provide a publication date for those counts. Toronto Zoo’s facts and figures sheet is the source for the property, regions, trails, and collection details.
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Animal and species counts produce a different comparison from acreage. San Diego Zoo reports more than 12,000 animals representing over 680 species and subspecies on a 100-acre footprint. Toronto Zoo reports approximately 5,816 animals and 495 species, excluding invertebrates. San Diego Zoo Safari Park reports more than 3,000 animals and over 293 species across 1,800 acres. These are the facilities’ reported figures, not a live, standardized census.
For the San Diego Zoo, the large collection is concentrated on a compact urban wildlife park and botanical garden footprint. Its 2026 fact sheet describes Panda Ridge, home to giant pandas Xin Bao and Yun Chuan, who arrived in 2024. The fact sheet’s “species and subspecies” wording matters: it is not directly equivalent to a figure that counts only species, and the figures may use different collection definitions. The San Diego Zoo fact sheet supplies the area, collection, and Panda Ridge details.
The Safari Park illustrates the opposite spatial pattern. Its 1,800-acre property includes expansive savanna habitats with mixed-species herds, and the published collection is smaller by animal count than the San Diego Zoo’s while the land footprint is much larger. The Safari Park’s 2026 fact sheet reports more than 3,000 animals and over 293 species; the differing scale and habitat design mean the count alone cannot describe what a visitor sees. The park lists the Africa Tram and guided experiences including wildlife, cart, and other safaris. Schedules and availability can change, so check the facility’s current visitor information when planning a trip. The Safari Park’s 2026 fact sheet describes its acreage, collection, habitats, and experiences.
Omaha’s Henry Doorly Zoo and Aquarium shows why AZA’s composite measure differs from either a land-only or animal-only count. AZA cites over 130 acres and over 960 species as part of its “biggest overall” designation, which also factors in exhibit sizes. The available comparison does not supply a matching animal total, so it would be wrong to infer that the facility has the most animals from its species figure.
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What animals and habitats make these large zoos distinctive?
Large grounds can support different ways of arranging habitats, but acreage alone does not tell you which animals live there or how they are housed. Toronto Zoo’s seven regions organize its collection around broad zoogeographic areas, including a Canadian Domain and Tundra Trek as well as Africa and Indo-Malaya. This approach gives visitors a route through geographic groupings; it does not mean every animal from a region is represented.
San Diego Zoo Safari Park emphasizes wide savanna settings and mixed-species herds. That makes its experience distinct from a compact, walk-through city zoo: guided options such as the Africa Tram provide a way to view large habitats without covering the entire property on foot. The presence of these experiences does not make the park’s 1,800-acre figure equivalent to an open wildlife reserve, nor does the available fact sheet provide a direct comparison of how much land each species uses.
The San Diego Zoo pairs a smaller footprint with a notably large reported collection and botanical-garden identity. Panda Ridge is one specific example of animals and habitats highlighted in its current fact sheet: Xin Bao and Yun Chuan arrived in 2024. It is a reminder that the number of species, the number of animals, and the physical scale of exhibits describe separate aspects of a zoo. None of those figures alone explains the full visitor experience or the care practices behind it.
For visitors, the practical difference between a spread-out park and a compact zoo is time and distance. Toronto’s fact sheet describes over 10 km of walking trails, while the Safari Park lists tram and guided safari experiences. Before going, check current hours, route access, and experience availability directly with the facility; the cited factsheets establish that these options exist, not that a particular schedule or route will operate on every date.
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No. Acreage measures land, not welfare outcomes, veterinary care, habitat quality, or conservation impact. A large property may allow expansive habitats, while a smaller one may have a different collection and exhibit design. The cited sources do not provide a comparable welfare outcome measure that would support ranking these institutions by animal care.
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Accreditation and conservation activity can add context, but they are not interchangeable with size. AZA’s statistics page says that, as of its March 2026 facility update, it accredited 254 zoos, aquariums, and related facilities across 12 countries. It reports that accredited facilities cared for over 780,000 animals across over 8,600 species. Those totals refer to the accredited sector, not all zoos worldwide. The page also reports that AZA-accredited facilities spent $372.4 million on field conservation in 2025, benefiting 1,200 species and subspecies. Those are sector-wide totals; they do not establish the results of any one facility’s work. AZA’s statistics page provides the dated facility, collection, conservation, and economic figures.
AZA further reports $35 billion in economic impact, more than 254,000 full-time jobs, and more than 209 million annual visitors based on its most recent survey in 2024. These are figures for AZA-accredited zoos and aquariums, not a global industry census. They help describe the sector’s scale but are not evidence that a particular zoo’s size improves conservation outcomes or animal welfare.
When evaluating a zoo beyond its acreage, look for its accreditation status, the specific conservation programs it identifies, and transparent information about animal care and habitats. Ask what a statistic measures and which year it covers. A facility’s large footprint can be relevant to the visitor experience and habitat layout, but it should not be treated as a quality score.
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Choose based on the kind of visit you want, not just the largest number in a headline. A big property can mean extensive walking, while a safari park may offer tram or guided options. A compact zoo may still have a large reported collection. Check the current visit details on the facility’s own site because route access, schedules, and seasonal offerings can change.
- Decide what you want to see. If regional organization interests you, Toronto Zoo’s seven zoogeographic areas offer a clearly described framework. If you prefer savanna settings and mixed-species herds, the Safari Park’s fact sheet describes those habitats.
- Match the property to your time and mobility. Toronto reports more than 10 km of walking trails. The Safari Park lists the Africa Tram and guided safari experiences; confirm current schedules and access before your visit.
- Use collection counts carefully. A facility with more species is not necessarily larger in acreage, and reported counts may distinguish species from subspecies or exclude invertebrates. Check the exact wording and date attached to the figure.
- Verify current visitor information. The cited factsheets explain facilities and experiences but do not guarantee that a particular route or activity will be available on your chosen day.
If viewing across broad habitats is part of your plan, compact binoculars may be an optional aid; the source material supports the existence of expansive habitats, not a specific model or a universal policy on binocular use. Follow each facility’s posted rules.
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How were these “biggest” examples selected?
The examples use the supplied AZA category comparison and official facility fact sheets, with each measurement labeled rather than blended into a false single ranking. The acreage examples distinguish zoo, safari park, and natural-habitat zoo categories; the collection examples preserve the source’s wording for animals, species, and subspecies. The AZA statistics are included as sector context and are explicitly limited to accredited facilities. No comparable evidence supports ranking these places by welfare quality, and the available material is not a complete census of zoos worldwide.
Frequently Asked Questions
Are The Wilds and a traditional zoo the same kind of facility?
Not in the comparisons used here: AZA identifies The Wilds as a safari park, a category with a different land-use and visitor-experience context from a zoo. Its acreage should therefore not be used as though it were a like-for-like zoo exhibit footprint.
Why do zoo animal totals sometimes exclude invertebrates?
Collection figures depend on the counting rules used by the institution. Toronto Zoo’s reported total explicitly excludes invertebrates, so comparing it with a figure that does not state the same exclusion may not be an apples-to-apples comparison.
How many zoos are accredited by AZA?
AZA’s facility statistics page reported 254 accredited zoos, aquariums, and related facilities across 12 countries in a March 2026 update. That count describes AZA accreditation, not every zoo or aquarium in the world.
Do the San Diego Zoo and Safari Park share the same animal collection?
The cited fact sheets report them separately as distinct facilities, with different footprints, collection figures, and habitat descriptions. They are both part of San Diego Zoo Wildlife Alliance, but the figures should not be added or treated as a combined collection without a source that defines how to do so.
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