There are five types of rhinos: White, Black, Indian, Sumatran, and Javan. Rhinos are critically endangered due to poaching for their horns. Statistics provided indicate there are approximately 24,000 rhinos remaining worldwide. The Javan rhino has fewer than 100 individuals left. Rhinos live in Africa, Asia, and India and have thick skin, poor eyesight but good hearing. Their horns are made of keratin like human hair and nails.