The Singapore Zoo (Chinese: 新加坡动物园; pinyin: Xīnjiāpō Dòngwùyuán; Malay: 'Taman Haiwan Singapura'; Tamil: சிங்கப்பூர் விலங்குக் காட்சிச்சாலை), formerly known as the Singapore Zoological Gardens and commonly known locally as the Mandai Zoo, occupies 28 hectares (69 acres) on the margins of Upper Seletar Reservoir within Singapore's heavily forested central catchment area. The zoo was built at a cost of S$9m granted by the government of Singapore and opened on 27 June 1973. It is operated by Wildlife Reserves Singapore, who also manage the neighbouring Night Safari and the Jurong BirdPark. There are about 315 species of animal in the zoo, of which some 16 percent are considered threatened species.