Rhinos existed back in prehistoric times and when flourished in thousands, moving into diverse habitats across Africa, Asia, Europe and North America. Today, due to poaching and habitat loss, few remain. Since 1970 alone, the rhinoceros population has declined by approximately 90 percent, in line with the American Wildlife Foundation. As of 2010, you can find five type of rhinos totaling approximately 24,500 within the wild and 1,250 in captivity, reports the International Union for Conservation of Nature (IUCN). The White Rhino is under threat of extinction and also the other four species are saved to the verge of extinction. The five remaining species are: