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.

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 ...

“Remember to always keep your distance — 25 yards from bison and elk; 100 yards from all other wildlife.” (Click here if video player does not appear above.) While commemorating National ...

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

Among those bison who field-tested positive for brucellosis and were killed between 1996 and 1999, 80 percent later tested negative for the disease in more reliable lab tests. Thousands of elk in ...

Male bison are particularly aggressive right now, though all bison and other wildlife can be dangerous. Remember to always keep your distance—25 yards from bison and elk; 100 yards from all other ...