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Which Northern Hemisphere bovid groups commonly have twins?

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An American bison, or plains buffalo (Bison bison), stands in tall yellow grass with open plains in the background. — bovid American bison, or plains buffalo (*Bison bison*).

In the Northern Hemisphere, twins are commonly found among bovid groups belonging to the Antilopini, Caprini, and Boselaphini tribes. While all African bovids typically bear single young, these specific Northern Hemisphere groups are notable for the frequent occurrence of twins.1