Lions and tigers and bears and more! Each year, more than 140 million people flock to the nation's zoos. Here are the U.S. zoos with the biggest variety of wildlife.
1. Omaha's Henry Doorly Zoo - 963 species
2. San Diego Zoo - 840 species
3. Houston Zoo - 827 species
4. Saint Louis Zoo - 819 species
5. Columbus Zoo and Aquarium - 787 species
Source: American Zoo and Aquarium Association, 2004