A wildlife expedition guide has shared a video of the "most extreme bear interaction" he has seen in his 25 years on the job. The clip, which you can watch below, shows two huge male grizzly bears locked in a vicious fight for dominance at Lake Clark National Park and Preserve, Alaska.
Brad Josephs, who posted the video on YouTube earlier this week, says that his mission is to encourage appreciation and conservation of wilderness, particularly wild carnivores, which are under threat from humans.
