Snails use the contraction of abdominal muscles to move forward. The snail's abdomen has a wide and thin transverse fold, and its back end is sharp, which is its "foot" When a snail crawls, it clings to the ground with its "feet" and can crawl forward slowly by the ups and downs of abdominal muscles. At the same time, the snail has foot glands, which can secrete a kind of mucus to help it crawl. And through the mucus secreted along the way, it is easier to move on the rough ground.