Lands west of the Continental Divide of the USA, including the Great Basin, Sonoran, Mojave, and Colorado Plateau deserts, along with the Palouse Prairie grasslands of eastern Washington, western Montana, and northern Idaho, did not evolve with significant grazing pressure from bison (Bison bison) [9, 12, 13].
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13. G. Wuerthner, “Are cows just domestic bison? Behavioral and habitat use differences between cattle and bison,” in Proceedings of an International Symposium on Bison Ecology and Management in North America, L. Irby, L. Knight, and J. Knight, Eds., pp. 374–383, Bozeman, Mont, USA, June 1998.