Click beetles total about 8 000 species. These long, slender beetles jump or make a clicking sound if disturbed. They do this by means of a hook-like part that locks the first and second segments of the thorax. By building up pressure between these two body segments and then releasing the hook, a sudden body jerk and clicking sound is produced. Adult click beetles are commonly attracted to lights at night. Most larvae of click beetles are slender and have hard, ring-like body segments. These larvae are commonly called wireworms and eat the roots and seeds of crop plants.