The collective noun for a group of rhinoceroses is crash. In English, rhinoceros or rhinoceroses are the plural forms. Since the fourteenth century, the name has been in use.
A member of any of the five species of odd-toed ungulates in the family Rhinocerotidae is referred to as a rhinoceros, or simply as a rhino. Three of the extant species are found in South and Southeast Asia, while two are native to Africa.
All rhinoceroses weigh at least one tonne when they are adults, making them among of the biggest mega-fauna still living. They consume only plants, have tiny brains compared to other animals their size, one or two horns, and a thick, protective skin made of collagen layers arranged in a lattice pattern. They eat leafy material, although their ability to ferment food in their hind-gut allows them to subsist on more fibrous plant matter when necessary. The two African species of rhinoceros, in contrast to other perissodactyls, lack front teeth and feed instead with their lips.
Due to rhinoceros being murdered by poachers for their horns, which fetch high prices on the black market, most extant rhinoceros species are now categorized as endangered. The two countries that dominate the modern rhino horn market are China and Vietnam, where rich people purchase it for use in traditional Chinese medicine and other purposes. There is no solid proof that rhino horns provide any health advantages. Keratin, the substance that makes up fingernails and hair, is used to make rhino horns. Yemen, which was the main source of demand for rhino horn in the 1970s and 1980s, has a market for rhino horn dagger handles as well.
