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The serpentine method is used by snakes both in land and water. The serpentine method employs a wavy S-shaped horizontal movement. This is also known as lateral undulation. The snake moves from side to side with the body by first contracting the muscles at the head. It creates a series of curves. The snake will next push on any rock or tree to move forward. This is not effective on slippery surfaces.

The rectilinear method is a slow and straight-line movement. The wide ventral scales on the belly are used to grab the ground while the other scales are used to move forward. You will notice small up and down curves instead of the side curves seen in serpentine movement. The rectilinear method is similar in caterpillars and is used by larger snakes.