Visenter som stångas på Skansen. European bison at Skansen open air museum.

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A bison is any cattle that constitutes the genus Bison, there are fifteen known bison species, only two of which are still with us in modern times, the fifteen bison species are †Iberian Bison (Bison voigtstendtensis), the †Menner's Bison (Bison menneri), the European Bison (Bison bonasus), the †Italian Bison (Bison deguilii), the †Taman Bison (Bison tamanensis), the †Georgian Bison (Bison georicus), the †Caucasian Bison (Bison caucasicus), the †Siwalik Bison (Bison sivalensis), the †Steppe Bison (Bison priscus), the †Chinese Bison (Bison palaeosinensis), the †Siberian Bison (Bison schoetensacki), the †Antique Bison (Bison antiquus), the †Occidental Bison (Bison occidentalis), the †Long-Horned Bison (Bison latifrons), and the American Bison (Bison bison), the closest living relative of the bison (genus Bison) is the Yak (Poephagus grunniens), which is the sole extant representative of the genus Poephagus, the genera Poephagus (Yak Lineage) and Bison (Bison) split from a common ancestor in Europe during the Pliocene.