To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 3. Snake robot performing vertical undulation in lateral view. Generation of propulsive force via vertical undulations in snakes Derek J. Jurestovsky, Logan R. Usher, and Henry C. Astley Journal of Experimental Biology 2021. 224:None-None; doi: 10.1242/jeb.239020 Download Original Video