"Why do we always feel the need to destroy?" Yellowstone National Park worker shares upsetting photos of visitors' shocking ...

A video taken in Yellowstone National Park shows a lone female wolf competing with two grizzly bears for the rights to a ...

Yellowstone recorded a record-high number of bear jams — 499 with grizzly bears and another 760 black bear gridlocks.

A herd of bison gorged on fresh green grass while roaming Mammoth, Wyoming on the northwest edge of Yellowstone National Park ...

A cold morning mist lingers over the wide valleys of Yellowstone National Park as a mighty herd of bison rumbles across the ...