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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.
A great shot. In N.D.'s TR North park I got side and back shots of a non-alpha bull that went 5 feet past my tent. It is surprising how quietly such a large animal can move.