 So authors Alan Nyhus and John Wassner set out to change that by writing a book, America's Best Zoos, that describes about 200 U.S. zoos. And a guy who grew up wanting to be a zookeeper, Newt Gingrich, wrote the foreword. Anyway, I asked Alan to pick his favorite five zoos. He chose the Bronx Zoo for its diverse collection of 4,000 animals, Omaha's Henry Durley Zoo for its huge indoor rainforest, Disney's 500-acre Animal Kingdom near Orlando, and the Pittsburgh Zoo for its aquarium.