The Saint Louis Zoological Park is a zoo in Forest Park in St. Louis, Missouri. It is recognized as a leading zoo in animal management, research, conservation, and education. Admission is free, although there are fees for some attractions. One special feature is the Zooline Railroad, a small passenger train that encircles the zoo, stopping at the more popular attractions. It is also home to the best grounds crew of any theme park in the world.
The 1904 St. Louis World´s Fair is credited for the birth of the St. Louis Zoo. The Fair brought the world´s attention to St. Louis and Forest Park. The Smithsonian Institution constructed a walk-through bird cage for the World´s Fair. Ten days after the World´s Fair closed, the citizens of St. Louis chose to buy the 1904 World´s Fair Flight Cage for $3,500, rather than have it dismantled and returned to Washington, D.C. The St. Louis Zoo was born.