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American bison, Bos bison.
It is my understanding that brucellosis, a disease that affects humans, bison, cattle, and elk, is transmitted from Bison to other Bison or to other animals such as cattle via contact with fresh afterbirth.
Nice photo. Neat compostion. Great mood. And it fits right in with the "Dances With Wolves" marathon that was running on TV all weekend! :)