Earthworms also night crawlers, move though the earth by lengthening the front of their segmented bodies, then contracting the backs. They live under ground where we cannot see them, but if you make this wormery, you can observe the way earthworms crawl.
The materials you need to properly perform this project are a jar, soil, sand, garden spade, 2 or 3 earthworms, leaves, rubber band, black construction paper