How they move?

Worm move using a combination of muscle contractions and tiny gripping structures on their bodies.

Most worm, like earthworm, have long bodies made up of many segments. Inside each segment are two main sets of muscles: circular muscles that wrap around the body and longitudinal muscles that run lengthwise. To move forward, the worm first contracts its circular muscles. This makes the body segment longer and thinner, pushing the front end forward. Next, the longitudinal muscles contract, shortening and thickening the segment and pulling the rest of the body ahead.

To keep from slipping backward, worm use small bristles called setae on the underside of their bodies. These bristles grip the soil or surface, anchoring parts of the body while other parts move forward. By repeating this cycle of stretching, anchoring, and pulling, the worm creates a wave-like motion that slowly moves it along.

This coordinated pattern of muscle contractions is called peristalsis, and it allows worm to crawl through soil, leaves, and other environments efficiently—even without legs.