system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How do snakes move?
gpt
There are four snake movement schemes: serpentine (slithering), concertina, side-winder, and reticulation.  The bottom of a snake has little grippers which hold the ground, and the snake lifts or moves parts of its body while pressing down onto the ground with other parts of its body.  Not all snakes use all schemes.