The Madras Crocodile Bank Trust and Centre for Herpetology (MCBT) is a reptile zoo and herpetology research station, located south of the city of Chennai, in state of Tamil Nadu, India. The centre is both a registered trust and a recognized zoo under the Wildlife (Protection) Act, 1972 and comes under the purview of the Central Zoo Authority, Ministry of Environment and Forests, Government of India. It was established with the aim of saving three Indian endangered species of crocodile—the marsh or mugger crocodile, the saltwater crocodile, and the gharial, which at the time of founding of the trust were all nearing extinction. The CrocBank grounds are covered by coastal dune forest providing a haven for native wildlife, including large breeding colonies of water birds and a secure nesting beach for olive ridley sea turtles. The high aquifer on the sandy coast provides sufficient water supply and the proximity to the major tourist destination of Mahabalipuram ensures annual visitation. The centre is the biggest crocodile sanctuary in India. It covers and had over 450,000 visitors in 2007. The centre has one of the world's largest collections of crocodiles and alligators and has bred 5,000 crocodiles and alligators representing 14 of the 23 existing species, including the three crocodile species, all considered endangered, that are native to India. As of 2011, the CrocBank has a total of 2,483 animals, including 14 species of crocodiles, 10 species of turtles, 3 species of snakes, and 1 species of lizard. History Large-scale commercial hunting of Indian crocodilians for their skin began towards the end of the 19th century, and by the 1970s, crocodile populations were severely depleted. The Madras Crocodile Bank was conceived in 1973 and started on 26 August 1976 by herpetologist Romulus Whitaker and his wife Zai Whitaker at the time when the Indian government protected all three species of Indian crocodilians under the Wild Life Protection Act of 1972. The real push for captive breeding of crocodiles came after the launch of the Indian Crocodile Conservation Project by the Indian government in collaboration with the United Nations Development Programme (UNDP) and the Food and Agriculture Organization (FAO) in 1975. The bank was started to protect India's dwindling crocodile population and to preserve the art of snake catching. Along with other like-minded people such as Rajamani, Whitaker founded the bank to conserve the three species of reptiles namely, the mugger (Crocodylus palustris),