Woodlouse

A woodlouse (plural woodlice), also known by many common names (see below), is an isopod crustacean with a rigid, segmented, long exoskeleton and fourteen jointed limbs. Mostly they feed on dead plant material, and they are usually active at night. Woodlice form the suborder Oniscidea within the order Isopoda, with over 5,000 known species.