Pill Bug

 Roly Poly, Armadillo Bug  or woodlouse on dried cow dung.  A woodlouse (plural: woodlice) is a terrestrial isopod crustacean with a long, rigid, segmented exoskeleton and fourteen jointed limbs. Woodlice mostly feed on dead plant material, and they are usually active at night. Woodlice form the suborder Oniscidea within the order Isopoda, with 3,637 species validated in scientific literature by 2004.  (WIKI)