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

A raw display of power and determination was witnessed by Yellowstone tourists Monday as a wolf battled a much larger grizzly ...

A bison in Yellowstone National Park appeared to stumble into the scalding water of Grand Prismatic Spring, causing its death as tourists looked on during the park's busiest season. The bison fell ...

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

The roars of a grizzly echoed from a riverbank in Yellowstone National Park on Sunday, as it postured with a wolf over a ...

A bison gored a man Tuesday after a large group of visitors got too close to the animal in Yellowstone National Park, officials said. The 30-year-old from Randolph, New Jersey, was treated for minor ...

The speed limit in most of Yellowstone National Park is 45 mph. But if bison are utilizing the roads, obviously, the speed limit is dictated by the iconic beasts. Trent Sizemore, a photographer and ...