YELLOWSTONE NATIONAL PARK, Wyo. --A man in Wyoming was driving when he looked in his rearview mirror and saw a grizzly bear chasing a bison.Alex Wypyszinski was at Yellowstone National Park when it happened. He was driving down an abandoned road when he heard what sounded like thunder and saw two brown blurs coming towards him.
The hungry grizzly chased the injured bison past his car and into the nearby woods, but it never caught up to the buffalo and gave up.
The photos, taken by Wypyszinski, have become an Internet sensation.