Grades K–2 · Organisms
How does a snail move without legs or wheels?
A snail carries its shell along without legs stepping underneath it. Instead, it moves on a broad body part called a foot. This foot lies under the snail and is made of muscle.
In the diagramA snail glides on its muscular footMucus layerMuscular footMuscle waves help the body glide.The shell travels with the snail; it is not a wheel.
Small waves of muscle movement pass along the foot. These movements help move the body across the surface. A layer of mucus, often called slime, helps the foot glide. The slime and moving muscles work together; slime alone does not pull the snail forward.
As the foot keeps moving, the body travels with it, carrying the shell along too. The shell does not roll like a wheel. What looks like a smooth slide is made possible by many small muscular movements underneath the animal.
About this explanation
Starting knowledge: Recognize a snail picture and movement from one position to another.
Sources
- Illinois Natural History Survey, University of Illinois — Snails and Slugs
- Missouri Department of Conservation — Land Snails and Slugs