What is the form of snake movement that allows it to move in a narrow passage,extending forward while bracing S-shaped loops against the sides of the passageway?

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Concertina movement is the form of snake movement that allows it to move in a narrow passage, extending forward while bracing S-shaped loops against the sides of the passageway. This movement is useful when the snake needs to move through tight spaces, such as narrow burrows or crevices, as it allows them to maintain a grip on the walls and move forward without getting stuck. Rectilinear movement involves the snake keeping its body straight and moving in a straight line, while sidewinding involves the snake moving sideways across a surface. Lateral undulation refers to the typical slithering movement of a snake using, in which it makes a wave-like motion along its entire body.

What Is the Form of Snake Movement That Allows It