Watch for Rattlesnakes

I've encountered three rattlesnakes in my life and killed one of them. The one I killed was in the Petrified Forest National Park, and it was inadvertent—I ran over the poor soul while it was crossing the road. I simply didn't see him until it was too late. The other two were both on White Butte, North Dakota's highest point. The first of those was two years ago, the second, on Tuesday.