"This person is very, very, very lucky that he wasn't killed," assistant park manager John Sullivan told KSL.com.
The man, who has not been identified, had reportedly been visiting the state park on Saturday when he provoked the animal. The bison, estimated to weigh a hefty 1,500 pounds, promptly charged at the man, slamming him into a nearby fence.
Sullivan told KSL.com that the man appeared to be "shell-shocked" but unharmed following the close encounter.
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Though bison are usually thought of as slow and nonaggressive creatures, animal experts say that they are can be unpredictable and dangerous if provoked.
According to a Today.com report from last September, a group of tourists in Yellowstone National Park learned this lesson the hard way when they were charged by an angry bison they had approached.
"This group has no idea how incredibly lucky they were that no one was injured or killed," the West Yellowstone Chamber of Commerce wrote in a Facebook post about the close call. "Yellowstone is an incredible place that allows us all to experience wildlife in a way that can you can nowhere in the world. But it is also a place where safety rules regarding wildlife and thermal features are so important to follow."
Following the incident, Al Nash, a park spokesman, told KPAX that people should stay at least 25 yards away from bison or elk.
"This is a wild place, and these are wild animals. They are bigger than you, and the only person who can look out for your safety is you," he said.
According to the website of Defenders of Wildlife, bison -- an endangered species -- can reach speeds of up to 35 mph. Yellowstone National Park has the "largest population of free-roaming plains bison," the website notes.