The woodlice (sowbugs) are various Crustaceans belonging to the suborder Oniscoidea, family Isopoda. They have segmented bodies and flattened undersides. The eggs are carried by the female in a pouch beneath the thorax. Some woodlice can roll themselves into a ball for protection when threatened. Found on http://www.probertencyclopaedia.com/browse/BW.HTM