Quote Originally Posted by Lioness
and how does it help nippy snakes not be so aggressive??
More than likely a nippy snake is not an aggressive snake. It's most likely stressed out and defensive. By providing more cover and sense of security, you allow the snake to relax a bit. That way it can become more used to it's environment without feeling like it's about to become lunch.

Now there are some snakes that may have a quirky behavioral issue, but I think those are rare.