What is the between land snakes and sea snakes?

I would guess the shore.... just kidding. The sea snakes are decended from land snakes. They have adapeted a vertically flattened tail for swimming. Many are VERY POISONOUS, in the extream. So don't try to pet any you might meet. Check out google video and you'll learn a lot. Also checkout NewMexico101.com and follow the upperleft link from the albino diamond back rattler... very cool stuff.