Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsModel of Snake Locomotion by Frictional Forceshttp://demonstrations.wolfram.com/ModelOfSnakeLocomotionByFrictionalForces/]]>http://demonstrations.wolfram.com/ModelOfSnakeLocomotionByFrictionalForces/