Ever wonder how admission to the St. Louis Zoo has remained free for over 100 years? The Zoo's business operations plays a big part. See how Zoo professionals manage a non-profit organization and keep the Zoo striving year around. You'll learn how all operations play an important role in supporting this timeless institution. Lunch buffet will start at approximatley 11:45am, followed by the tour starting at 12:30pm (ending at approx 2:00). You are welcome to walk the Zoo after the tour ends up until 5:00pm close.