The 15 top zoos:

1Zoologischer Garten Berlin and AquariumGermanyReview
2St. Louis Zoological ParkUSAReview
3Bronx zooUSAReview
4Cincinnati Zoo & Botanical GardenUSAReview
5Zoologicka Zahrada PrahaCzech RepublicReview
6Taronga ZooAustraliaReview
7Tierpark BerlinGermanyReview
8Zoologischer Garten LeipzigGermanyReview
9Chester ZooUnited KingdomReview
10Weltvogelpark WalsrodeGermanyReview
11Los Angeles Zoo and Botanical GardensUSAReview
12San Diego ZooUSAReview
13San Diego Safari ParkUSAReview
14Toronto ZooCanadaReview
15Minnesota ZooUSAReview