Is Australia zoo the biggest in world?

Australia Zoo is not the largest zoo in the world. There are larger zoos in terms of land area, number of animals, and species diversity. Some examples of larger zoos include:

1. Henry Doorly Zoo and Aquarium, Omaha, Nebraska, USA: This zoo covers an area of over 160 acres and is home to over 17,000 animals from over 1,000 species.

2. San Diego Zoo, San Diego, California, USA: The San Diego Zoo spans over 100 acres and houses more than 3,700 animals from over 650 species.

3. Columbus Zoo and Aquarium, Columbus, Ohio, USA: This zoo covers approximately 580 acres and is home to over 10,000 animals from over 575 species.

4. Singapore Zoo, Singapore: The Singapore Zoo spans about 69 acres and is home to more than 2,800 animals from over 300 species.

5. Bronx Zoo, New York City, New York, USA: This zoo covers an area of over 265 acres and is home to over 6,000 animals from more than 650 species.

These are just a few examples of larger zoos, but there may be others that surpass Australia Zoo in size and diversity.