It's not like this doesn't happen in Wyoming practically all the time. It's nature after all. But, it's not often you get to witness a grizzly take down an elk right next to the road as one Wyoming driver witnessed.
If you're from Wyoming and/or have been to Yellowstone frequently, you will not be surprised by this. However, it is truly a sight to be driving in the park and realize you are suddenly surrounded by a million bison.