It was seen as a medicine in ancient China ( TCM), a belief that was spread widely across to other Asian countries. Although rapidly declining in many regions, East Asia as well as a few other regions were seen as the largest market for rhino horns. Rhinoceros are killed by some poachers for their horns, which are bought and sold on the black market, and used by people in some cultures for ornaments or traditional medicine.
Unlike other perissodactyls, the two African species of rhinoceros lack teeth at the front of their mouths they rely instead on their lips to pluck food. They generally eat leafy material, although their ability to ferment food in their hindgut allows them to subsist on more fibrous plant matter when necessary. They have a herbivorous diet, small brains (400–600 g) for mammals of their size, one or two horns, and a thick (1.5–5 cm), protective skin formed from layers of collagen positioned in a lattice structure. Rhinoceroses are some of the largest remaining megafauna: all weigh at least one tonne in adulthood. (It can also refer to a member of any of the extinct species of the superfamily Rhinocerotoidea.) Two of the extant species are native to Africa, and three to South and Southeast Asia. A rhinoceros ( / r aɪ ˈ n ɒ s ər ə s/, from Greek rhinokerōs 'nose-horned', from rhis 'nose', and keras 'horn'), commonly abbreviated to rhino, is a member of any of the five extant species (or numerous extinct species) of odd-toed ungulates in the family Rhinocerotidae.
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