Wilhelma is a zoological and botanical garden in the setting of a 19th century park which is a classified historical monument. This triad of zoo, botanical gardens and historical park is what constitutes the great value and special charm of Wilhelma.
With over two million visitors in 2006, Wilhelma is the most favourite leisure-time institution in Stuttgart and one of the most often visited zoos in Germany. It is the only both zoological and botanical garden in Germany and is one of the zoos with the largest amount of animal species in the world.
Quoted from http://www.wilhelma.de