What is Odd-toed ungulate?
{{Taxobox | name = Odd-toed ungulates | fossil_range = <br/>Late [[Palaeocene]] {{ndash}} Recent | image = RhinoAtSDZ.jpg | image_width = 200px | image_caption = [[Rhinoceros]] | regnum = [[Animal]]ia | phylum = [[Chordata]] | classis = [[Mammal]]ia | infraclassis = [[Eutheria]] | superordo = [[Laurasiatheria]] | ordo = '''Perissodactyla''' | ordo_authority = [[Richard Owen|Owen]], 1848 <!-- | subdivision_ranks = Families | subdivision = [[Equidae]]<br /> [[Tapiridae]]<br /> [[Rhinocerotidae]] <br /> [[Brontotheriidae]] (extinct)<br /> [[Chalicotheriidae]] (extinct)<br /> [[Hyracodontidae]] (extinct)<br /> [[Palaeotheriidae]] (extinct)<br /> [[Amynodontidae]] (extinct)<br /> --> }} '''Odd-toed ungulates''' are the '''Perissodactyla''', an [[order (biology)|order]] of [[mammal]]s. Odd-toed [[ungulate]]s have an uneven number of [[toe]]s: [[Horses]] have only one toe, [[rhinoceros]] have three toes, and [[tapirs]] have four toes on the front feet and three toes on the hind feet. Their [[digestive system]] is more basic than the even-toed ungulates. A key difference between the two is that odd-toed ungulates digest plant [[cellulose]] in their intestines rather than in one or more stomach chambers as the [[even-toed ungulates]] do. Horses, for example, get much less nutrition out of grass than [[bovines]] do. This has the consequence that horses have to stop and feed more often, which in turn makes them more liable to predators. However, horses are very well-[[adapted]] for running, more so than many [[oxen]] or other Artiodactyls. The living ungulates are a much-reduced group: the horses (including [[zebras]]), the [[tapirs]] and the [[rhinoceros]].<ref>Ronald M. Nowak: Walker's Mammals of the World. 6th edition. Johns Hopkins University Press, Baltimore 1999, ISBN 0-8018-5789-9</ref> ==Taxonomy== * Order '''Perissodactyla''' ** Family [[Rhinocerotidae]] ** Family [[Tapiridae]] ** Family [[Equidae]] == References== {{wikispecies|Perissodactyla}} {{commonscat|Perissodactyla}} {{reflist}} {{-}} {{biology-st