I don't know my snakes but am a little interested. While in Missouri, I saw this thing on the road. We stopped, I took out my S-hook snake stick to safely examine the snake. It appeared to have the triangle shaped head and it eventually coiled up and struck at me after I provoked it enough. It showed no fear of me. Usually I find snakes heading for the weeds to get away. Is this yet another sign that it is a venomous snake? I though maybe a Cottonmouth. Am I correct?