The St. Louis Zoo is most definitely one of the best zoos in the country. As a matter of fact, most experts say that the St. Louis Zoo ranks second in the country, right after the San Diego Zoo. One thing that is unique about the St. Louis Zoo is that admission is free. This is most definitely a bargain considering the hundreds of animals from all around the world that call the St. Louis Zoo their home. Barbara and Cooper took us to the Zoo.