November 25, 2017
Bison overtaking an area on the North Rim of the Grand Canyon are cattle hybrids that are typically smaller than normal bison. (Photo by Kianna Gardner/Cronkite News)
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A spring used to rush through a hillside on the North Rim of the Grand Canyon, nourishing bats, mule deer and other wildlife — that is, until bison trampled the watering hole into a mud puddle.