How free-roaming bison in Yellowstone National Park are reshaping the ecosystem WBUR Published September 11, 2025 at 10:49 AM CDT Facebook Twitter LinkedIn Email Listen • 3:05 A new study finds free-roaming bison in Yellowstone National Park are reshaping the ecosystem. It’s not always for the better. NPR’s Nate Rott reports. This article was originally published on WBUR.org. Copyright 2025 WBUR