1. San Diego Zoo (San Diego, California)

sandiegozoo.org

2. Henry Doorly Zoo and Aquarium (Omaha, Nebraska)

omahazoo.com

3. BestZoo (Netherlands)

bestzoo.nl

4. Chester Zoo (Upton, England)

chesterzoo.org

5. Tiergarten Schönbrunn (Vienna, Austria)

zoovienna.at

6. Loro Parque (Spain)

loroparque.com

7. Berlin Zoological Garden (Germany)

zoo-berlin.de

8. Bronx Zoo (New York)

bronxzoo.com

9. Saint Louis Zoo (Missouri, United States)

stlzoo.org

10. Singapore Zoo (Singapore)

zoo.com.sg