European bison in Romania. silviumatei / iStock / Getty Images Plus
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A keystone species, bison once roamed the American Great Plains in the tens of millions, but were hunted to near extinction.
Bison are known as ecosystem engineers because they perform many services for the habitats in which they live, like rolling around and packing down soil in wallows that collect rainwater and grazing on different heights of grasses, which provide birds with nesting grounds.
A new study by…
Read the full article originally published at www.ecowatch.com.