How many times when you are spending your precious time in the traffic jam can you realize that the jam is caused not by the flipped over truck, other kind of accident or just a pure human stupidity, but by the nature itself? The big, smelly (and probably tasty) piece of nature.
It happens all the time in Dakota, both North and South:
But bisons are pretty common on the roads of the United States. The closer you are to the Yellowstone park, the greater chance they will put you in the middle of the traffic jam. They are just like those rednecks on the huge trucks covered from wheels to roof with religious bumper stickers. Kind of a normal thing of life. But how about zebra?
Or two lizards fighting?