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Suina (also known as Suiformes) is a suborder of omnivorous, non-ruminant artiodactyl mammals that includes the pig and Peccary. A member of this clade is known as a suine. Suina includes the family Suidae, termed suids, known in English as pigs or swine, as well as the family Tayassuidae, termed tayassuids or peccaries. Suines are largely native to Africa, South America, and Southeast Asia, with the exception of the wild boar, which is additionally native to Europe and Asia and introduced to North America and Australasia, including widespread use in farming of the domestic pig subspecies. Suines range in size from the 55 cm (22 in) long pygmy hog to the 210 cm (83 in) long giant forest hog, and are primarily found in forest, shrubland, and grassland , though some can be found in deserts, wetlands, or coastal regions. Most species do not have population estimates, though approximately two billion domestic pigs are used in farming, while several species are considered endangered or critically endangered with populations as low as 100. One species, Heude's pig, is considered by the International Union for Conservation of Nature to have gone extinct in the 20th century.
The suborder Suina consists of 21 extant taxon species in nine genera. These are split between the Suidae family, containing 18 species belonging to 6 genera, and the Tayassuidae family, containing 3 species in 3 genera. This does not include hybrid species such as boar–pig hybrids or extinct prehistoric species. Additionally, one species, Heude's pig, went extinct in the 20th century.
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