FILE: Bison seen in Arizona's Kaibab National Forest. (United States Department of Agriculture)
The growing bison herd occupying the northern reaches of Arizona's Grand Canyon National Park is decimating the area's ecosystem, and some conservationists are ready to call in the hunters.
The 600-head herd rarely if ever strays from the 1,900-square-mile park, where hunting is banned. If they were to stampede into the adjacent Kaibab National Forest, they might find themselves in the crosshairs of hunters with permits to bag them, but inside the park they are safe - and free to wreak havoc.