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Large male Bison (Bison bison) stares intimidatingly at the camera after approaching a female, checking her state—estrous or...
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Yellowstone NP

Large male Bison (Bison bison) stares intimidatingly at the camera after approaching a female, checking her state—estrous or not—to make it abundantly clear he was not going to tolerate any uninvited audience to his dalliance. Photo © copyright by Robert Faucher.

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