The Moscow Zoo was founded in 1864 by professor-biologists, K.F. Rulje, S.A. Usov and A.P. Bogdanov, from the
Moscow State University. In 1919, the zoo was nationalized. In 1922, the ownership was transferred to the
Government of Moscow and has remained under their control ever since. The zoo had an area of when it first opened, with 286 animals. In 1926, the zoo was expanded to adjacent lands, increasing the area to . In 1933,
Vera Chaplina, a naturalist and future writer, created the "green platform", a special enclosure for young animals where different cubs that their mothers refused to feed were not only raised, but also taught to live peacefully together. This experiment aroused great interest among visitors, and for many years the "green platform" remained one of the Moscow Zoo's main attractions. In 1990, the zoo was renovated. Notable additions include a new main entrance in the shape of a large rock castle, and a footbridge that connected the old (1864) and new (1926) properties of the zoo. In addition, the zoo was expanded once more. New exhibits were opened including a sea aquarium, an aviary, a creatures of the night exhibit, a sea lion exhibit and a section aimed at children. The Moscow zoo has over 7,500 animals representing about 1,000 species and covers an area of about . == Moscow Zoo Museum ==