尖額牛（學名Bos acutifrons）是最古老的牛。牠們一直在印度生存至更新世中期。一般均認為所有牛都是源自於牠們，而原牛可能是於150-200萬年前由牠們演化而來。
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參考
- Van Vuure, Cis. 2003. De Oeros – Het spoor terug, Cis van Vuure, Wageningen University and Research Centrum / Ministry of the Flemish Community, Brussels & Wageningen.
- Van Vuure, C. 2005. Retracing the Aurochs: History, Morphology and Ecology of an extinct wild ox. Sofia-Moscow:Pensoft Publishing.
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