A rhinoceros is a large herbivorous mammal with an odd number of toes. It is classified under Perissodactyla. A rhinoceros is known to be one of the largest land animals that exist currently. Its physical features include rough skin known as hide and one or two horns that are made of keratin material. There exists five species of rhinoceros: white and black found in Africa, while Indian, Javan, and Sumatran are found in Asia.