What Is the Largest Zoo in the United States?

Answer:

The largest by area is the Red McCombs Wildlife in Texas with over 5,000 hectares (12,500 acres).

The largest by species is the San Diego Zoo in Balboa Park, San Diego, California with over 4,000 animals of more than 800 species. Exhibits are often designed around a particular habitat. The same exhibit features many different animals that can be found side-by-side in the wild, along with their native horticulture. Exhibits range from an African rain forest to the Arctic taiga and tundra in the summertime. Some of the largest free-flight aviaries in existence are here. Many exhibits are "natural" with invisible wires and darkened blinds to view birds, and pools and open-air moats for large mammals.