Rhinoceros are large, herbivorous mammals that are native to Africa and Asia. There are five species of rhinoceros, three of which are native to Africa and two to Asia. Rhinoceros are characterized by their large size, thick skin, and horns. The African species include the white rhinoceros, the black rhinoceros, and the greater one-horned rhinoceros, while the Asian species include the Indian rhinoceros and the Javan rhinoceros. All five species are endangered, with three of them (the black rhinoceros, the greater one-horned rhinoceros, and the Javan rhinoceros) being critically endangered.
The rhinoceros is a large, herbivorous mammal that has been hunted for its horn since ancient times. The horn is made of keratin, the same material as human hair and nails, and is used in traditional Chinese medicine. The rhinoceros is believed to have originated in Africa, and its name means "nose horn" in Greek. The rhinoceros is an endangered species, and its population has declined sharply over the past century due to hunting and habitat loss.