Passage: The largest city park is Horský park (literally, Mountainous Park), in the Old Town. Bratislavský lesný park (Bratislava Forest Park) is located in the Little Carpathians and includes many locales popular among visitors, such as Železná studienka and Koliba. The Forest Park covers an area of 27.3 square kilometres (10.5 sq mi), of which 96% is forested mostly with oak and mixed oak/hornbeam forest, and contains original flora and fauna such as European badgers, red foxes, wild boar and red and roe deer. On the right bank of the Danube, in the borough of Petržalka, is Janko Kráľ Park founded in 1774–76. A new city park is planned for Petržalka between the Malý Draždiak and Veľký Draždiak lakes.Bratislava's zoological park is located in Mlynská dolina, near the headquarters of Slovak Television. The zoo, founded in 1960, currently houses 152 species of animals, including the rare white lion and white tiger. The Botanical Gardens, which belong to Comenius University, can be found on the Danube riverfront and house more than 120 species of domestic and foreign origin.The city has a number of natural and man-made lakes, most of which are used for recreation. Examples include Štrkovec lake in Ružinov, Kuchajda in Nové Mesto, Zlaté Piesky and the Vajnory lakes in the north-east, and Rusovce lake in the south, which is popular with nudists.

Question: How many species does the Botanical garden house?
120