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.

The difference between buffalo and bison in the shape of their bodies is that the Buffalo has fairly straight backs, with necks that extend up at an angle like most quadrupeds. Because of their ...

Plains bison numbers, which were once nearly driven to extinction, are on the rise across the United States and Canada, with 45,000 found across North America today. Bison conservation isn’t ...