The Javan rhinoceros, known more precisely as the Sunda rhinoceros, was once the most widespread of Asian rhinoceroses. It ranged from the islands of Java and Sumatra, throughout Southeast Asia, and into India and China. Today the species is critically endangered, with only one known population in the wild, and no individuals in captivity. It is possibly the rarest large mammal on earth as there are thought to be around only 50 of the animals left in existence, all living in the wild in Ujung Kulon National Park, on the western tip of Indonesia's main island of Java. Conservationists hope that the opening of the country's first ever Javan rhino sanctuary, which will open in the park in the coming months, will help pull the animal back from the brink of extinction.