The wildlife in Yellowstone National Park live there; the people are merely visitors. I stopped our car when I saw a bison (what some call buffalo) grazing by the side of the road; I wanted a good picture.
I certainly did not expect what happened next — the bison decided to calmly strut into traffic! He stayed there a while, too. In Yellowstone, the wildlife have the right-of-way.
At the time my wife took this picture, I did not yet realize that we were walking around on an active volcano when we recently visited Yellowstone National Park. The outgassing behind me, which I had just walked through, should have clued me in, since it had a strong smell of hydrogen sulfide mixed with hydrochloric and sulfuric acids. At a gift shop, I found a book by Greg Briening called Super Volcano: The Ticking Time Bomb Beneath Yellowstone National Park. It explains the science of Yellowstone, and makes a strong case that the volcano that created Yellowstone will blow up again, possibly soon, with cataclysmic consequences worldwide.