From the Toronto Zoo newsletter.
There are 5 rhino species left in the world. The southern white rhino numbers approximately 20,000.The northern white subspecies is considered extinct with only 7 known animals left on earth. The black rhino has a population of less than 4,900 animals. The Java rhino, found in Vietnam, at less than 50 surviving individuals is the most endangered.The Great Indian is found in India and numbers about 2,900 and, the Sumatran fewer than 200.
Rhinos have been with us for millenia and during the Ice Age, woolly rhinos lived side by side with the woolly mammals, an ancient elephant. Now, mostly due to poaching for their horn(which has no magical power and cannot cure disease), their numbers are declining at a horrific rate.