New video shows a man approaching a pack of wolves in Yellowstone National Park. Keith Allen Kerbs recorded the footage on October 6, saying he was photographing the five black wolves when the man approached them. The video shows the man spraying what he describes as bear spray at the wolves as he enters a ravine. The wolves eventually backed off, and the man walked away. The National Park Service says there have been no reports of wolves attacking humans in Yellowstone and recommends visitors stay at least 100 yards away from wolves.