Yellowstone Bison (IMAGE)

University of Wyoming

Yellowstone Bison

Caption

Bison graze on a patch of green grass in late summer in this August 2016 photo from Yellowstone National Park's Lamar Valley. Researchers have found that intensive grazing and fertilization by bison allow them to reset the clock on springtime plant growth, so they can migrate on their own terms, unlike mule deer and other ungulates.

Credit

Neal Herbert, National Park Service

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