Seth Royal Kroft shares a video of a grizzly bear along the Yellowstone River defending the bull elk it killed from a grey wolf. If you want to see the video of the bear taking the elk down watch Grizzly Bear Vs Bull Elk. The grizzly bear is identified as Grizzly 791 and had been feasting on the elk for five days when the grey wolf paid a visit. The bear is covering the elk up with dirt in between meals while sunbathing and napping by the river. A crowd of visitors to Yellowstone has gathered to watch the remarkable wildlife scene and take photos.