1. San Diego Zoo The San Diego Zoo is one of the largest and most renowned zoos in the world. It covers over 100 acres of Balboa Park and houses over 3,700 animals representing more than 650 species and subspecies.
2. Bronx Zoo Operated by the Wildlife Conservation Society, the Bronx Zoo spans approximately 265 acres and is one of the largest metropolitan zoos in the world.
3. Columbus Zoo and Aquarium The Columbus Zoo and Aquarium covers approximately 580 acres and houses over 10,000 animals representing over 600 species. It is one of the largest zoos in the United States by acreage.
4. North Carolina Zoo The North Carolina Zoo, also known as the NC Zoo, is one of the largest natural habitat zoos in the world. It spans approximately 2,600 acres and is divided into two main areas: North America and Africa.
5. Disney's Animal Kingdom While not a traditional zoo, Disney's Animal Kingdom is one of the largest animal theme parks in the world. It covers approximately 580 acres and features a variety of animal exhibits and attractions, including the Kilimanjaro Safaris, Maharajah Jungle Trek, and Pandora – The World of Avatar.
6. Houston Zoo The Houston Zoo covers approximately 55 acres and is home to over 6,000 animals representing over 900 species.