Question: Which large mammal that appears in the engraving for the Wildebeest Kuil Rock Art Centre, is one of any five extant species of odd-toed ungulates in the family Rhinocerotidae?
Context: Equus is a genus of mammals in the family Equidae, which includes horses, asses, and zebras. Within Equidae, "Equus" is the only recognized extant genus, comprising seven living species.  The term equine refers to any member of this genus, including horses.  Like Equidae more broadly, "Equus" has numerous extinct species known only from fossils.  The genus most likely originated in North America and spread quickly to the Old World.  Equines are odd-toed ungulates with slender legs, long heads, relatively long necks, manes (erect in most subspecies) and long tails.  All species are herbivorous, and mostly grazers with simpler digestive systems than ruminants but able to subsist on lower quality vegetation. Members of the order Perissodactyla, otherwise known as odd-toed ungulates, are mammals characterized by an odd number of toes and by hindgut fermentation with somewhat simple stomachs.  Perissodactyla comes from the Ancient Greek περισσός ("perissós", “uneven”) + δάκτυλος ("dáktulos", “a finger, toe”).  Unlike the even-toed ungulates, they digest plant cellulose in their intestines rather than in one or more stomach chambers.  The order includes three extant families: Equidae (horses, asses, and zebras), Rhinocerotidae (rhinoceroses), and Tapiridae (tapirs), with a total of about 17 species.  Despite their very different appearances, they were recognized as related families in the 19th century by the zoologist Richard Owen, who also coined the order name. Tapirus kabomani (also known as the little black tapir or kabomani tapir) is one of five extant species of tapir, large browsing mammals similar in shape to a pig.  It is the smallest tapir species, even smaller than mountain tapir ("T. pinchaque"), which had been considered the smallest.  "T. kabomani" is found in the Amazon rainforest, where it appears to be sympatric with the South American tapir ("T. terrestris").  When it was announced in December 2013, "T. kabomani" was the first odd-toed ungulate discovered in over 100 years. The Sumatran rhinoceros, also known as the hairy rhinoceros or Asian two-horned rhinoceros ("Dicerorhinus sumatrensis"), is a rare member of the family Rhinocerotidae and one of five extant rhinoceroses.  It is the only extant species of the genus Dicerorhinus.  It is the smallest rhinoceros, although it is still a large mammal; it stands 112 - high at the shoulder, with a head-and-body length of 2.36 - and a tail of 35 - .  The weight is reported to range from 500 to , averaging 700 - , although there is a single record of a 2000 kg specimen.  Like both African species, it has two horns; the larger is the nasal horn, typically 15 - , while the other horn is typically a stub.  A coat of reddish-brown hair covers most of the Sumatran rhino's body. A tapir ( , , or ) is a large, herbivorous mammal, similar in shape to a pig, with a short, prehensile nose trunk.  Tapirs inhabit jungle and forest regions of South America, Central America, and Southeastern Asia.  The five extant species of tapirs are the Brazilian tapir, the Malayan tapir, the Baird's tapir, the kabomani tapir, and the mountain tapir.  The four species that have been evaluated (the Brazilian, Malayan, Baird's and mountain tapir) are all classified as endangered or vulnerable.  Their closest relatives are the other odd-toed ungulates, which include horses, donkeys, zebras and rhinoceroses. A rhinoceros ( , , ), often abbreviated to rhino, is one of any five extant species of odd-toed ungulates in the family Rhinocerotidae, as well as any of the numerous extinct species.  Two of the extant species are native to Africa and three to Southern Asia. The common hippopotamus ("Hippopotamus amphibius"), or hippo, is a large, mostly herbivorous and aggressive mammal in sub-Saharan Africa, and one of only two extant species in the family Hippopotamidae, the other being the pygmy hippopotamus ("Choeropsis liberiensis" or "Hexaprotodon liberiensis").  The name comes from the ancient Greek for "river horse" (ἱπποπόταμος ).  After the elephant and rhinoceros, the common hippopotamus is the third-largest type of land mammal and the heaviest extant artiodactyl.  Despite their physical resemblance to pigs and other terrestrial even-toed ungulates, the closest living relatives of the Hippopotamidae are cetaceans (whales, dolphins, porpoises, etc.) from which they diverged about .  The common ancestor of whales and hippos split from other even-toed ungulates around .  The earliest known hippopotamus fossils, belonging to the genus "Kenyapotamus" in Africa, date to around . Wildebeest Kuil Rock Art Centre is a rock engraving site with visitor centre on land owned by the ! Xun and Khwe San situated about 16 km from Kimberley, Northern Cape, South Africa.  It is a declared Provincial Heritage Site managed by the Northern Cape Rock Art Trust in association with the McGregor Museum.  The engravings exemplify one of the forms often referred to as ‘Bushman rock art’ – or Khoe-San rock art – with the rock paintings of the Drakensberg, Cederberg and other regions of South Africa being generally better known occurrences.  Differing in technique, the engravings have many features in common with rock paintings.  A greater emphasis on large mammals such as elephant, rhino and hippo, in addition to eland, and an often reduced concern with depicting the human form set the engravings apart from the paintings of the sub-continent. Ungulates (pronounced ) are any members of a diverse group of primarily large mammals that includes odd-toed ungulates such as horses and rhinoceroses, and even-toed ungulates such as cattle, pigs, giraffes, camels, deer, and hippopotamuses.  Most terrestrial ungulates use the tips of their toes, usually hoofed, to sustain their whole body weight while moving. The Javan rhinoceros ("Rhinoceros sondaicus"), also known as the Sunda rhinoceros or lesser one-horned rhinoceros, is a very rare member of the family Rhinocerotidae and one of five extant rhinoceroses.  It belongs to the same genus as the Indian rhinoceros, and has similar mosaicked, armour-like skin, but at 3.1 – in length and 1.4 – in height, it is smaller (closer in size to the black rhinoceros of the genus "Diceros").  Its horn is usually shorter than 25 cm , and is smaller than those of the other rhino species.  Only adult males have horns; females lack them altogether.
Answer: rhinoceros