Wild animals do not recognize park borders. Two of Yellowstone’s iconic species, bison and elk, spill seasonally—and naturally—beyond park boundaries looking for food. One is welcome.

On National Bison Day comes a video reminder, courtesy of Yellowstone National Park, of the awesome power of these legendary beasts.

At one point, she turns her back to the bull elk, and that was one of many questionable mistakes she made that day. Just as ...

Bison are a bio-cultural keystone species. As ecological engineers, they can restore grasslands. This means healthier soil ...