You mess with the calf, you get the herd. It's estimated that around 4,500 bison roam around Yellowstone National Park.

Add Yahoo as a preferred source to see more of our stories on Google. A grizzly bear’s size and strength make it a dominant force in the wild, but a coordinated wolf pack presents a serious challenge.

A new clip out of Yellowstone offers a rare look at the brutal reality of kleptoparasitism in the backcountry. Watch a pack ...

In the wild, survival is defined by constant conflict where predators must fight not only for food, but for territory, dominance, and the right to reproduce . From wolves relying on coordinated pack ...