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Gait of Animals, , 339, , Fig: Locomotion in earthworm, , Earthworm: Earthworm has a segmented body. It has a, large number of very small bristles on the ventral surface of, the body. The surface which is close to the base is called, ventral surface. These bristles are connected with muscles at, their bases. The earthworm moves by contracting and, expanding alternate portions of its body. When the anterior, or front part of the body contracts, the earthworm holds the, ground with its bristles; and drags the posterior potion of its, body forward. After that, it contracts the posterior portion., and holds the ground with bristles. Now, the anterior portion, of the body expands and moves forward., , Snail: The snail has muscular foot which helps in, locomotion. The muscular foot is made up of strong, muscles., , Cockroach: A cockroach has three pairs of jointed legs,, which help it to walk, run and climb. It also has two pairs, of wings; for flying. Large and strong muscles help in the, movement of legs., , 6