Keith Kerbs was watching wolves at Yellowstone National Park several weeks ago when he saw a man getting very close to them. That's when he began snapping photos and recording a video that has since gone viral online, sparking outrage.

Watch the story behind the viral video:

"Ill be honest with you while I was recording it, I thought this could go viral. It did occur to me, but then I was like, who am I I'm nobody. Then to see it go like this is kind of crazy," said Kerbs, a photographer visiting the park from Washington.

Kerbs says he and other wolf watchers were several hundred yards away. He says he was able to capture what he called an "extremely dangerous" decision because he was using a 500-millimeter lens.

"I saw movement, and I saw this guy walking toward the wolves and Im like

See Full Page