High Quality Content by WIKIPEDIA articles! The Madras Crocodile Bank Trust (MCBT) is a reptile zoo and herpetology research station, located 40 km south of the city of Chennai, in state of Tamil Nadu, 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 were all nearing extinction. The center covers 8.5 beautifully landscaped acres and had over 450,000 visitors in 2007.