 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,