BOS
Bos (from Latin bōs: cow, ox, bull) is a genus of bovines, which includes, among others, wild and domestic cattle.
Bos is often divided into four subgenera: Bos, Bibos, Novibos, and Poephagus, but including these last three divisions within the genus Bos without including Bison is believed to be paraphyletic by many workers on the classification of the genus since the 1980s. The genus as traditionally defined has five extant species, but this rises to eight when the domesticated varieties are counted as separate species, and ten when the closely related Bison is also included. Most but not all modern breeds of domesticated cattle (including taurine cattle and zebu) are believed to have originated from the extinct aurochs. Others like Bali cattle and gayal are thought to have originated from South and Southeast Asian Bos species.
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