The Prospect Park Zoo is a 12-acre (4.9 ha) zoo located off Flatbush Avenue on the eastern side of Prospect Park, Brooklyn, New York City. Its precursor, the Menagerie, opened in 1890. The present facility first opened as a city zoo on July 3, 1935, and was part of a larger revitalization program of city parks, playgrounds and zoos initiated in 1934 by Parks Commissioner Robert Moses.