This is from the IMAX documentary: The Great North. William Reeves was the cameraman and Co. Director of the movie. He said, “I can verify that no human with a backpack, bicycle, black suit, or a black bear, was within 200 miles of this Caribou migration; The idea of a human chasing a herd that is running that fast is absurd. For non-believers, go there and try to get within 200 yards of a Caribou on foot, their survival instinct is more intelligent than a humans.” It doesn’t look like a person