For getting down to earth in Space City, there's nothing like the Houston Zoo. The not-for-profit zoo occupies 55-acres in Hermann Park at the heart of Houston's cultural district. It is home to more than 4,500 animals from about 800 species and hosts about 1.5 million visitors per year. Facilities include the McGovern Children's Zoo, Kipp Aquarium, the tropical bird house, Texas Wetlands, and the Wildlife Carousel. The zoo participates in programs that oversee the breeding of more than 40 endangered animal species. Several of its facilities may be reserved for private functions and private tours are offered "behind the scenes." The Houston Zoo was founded in 1922 to house a bison donated by the US government.