snake is a Linux executable, compiled on Attu. It is also known to run on the Linux boxen in the Allen Center basement labs. In case you still can't run it, I provide a movie of my model in action. (The movie format is MPEG-4. See www.xvid.org) The background in my snapshot was added in The Gimp. (Why do people assume Photoshop when they mean "edit an image"?) I picked this background (Mars) because the snake's texture reminded me of something that might camouflage there.