 One, shape of the head. That ain't always true. Doesn't always work that way. The slit pupil in their eye. No. They get all excited. It dilates. Guess what that is? Round. So we need more education on identifying that stuff. And a picture every now and then floating around on Facebook apparently isn't cutting it. I'm still fascinated by it. Makes me want to go out and find a snake. What about you?