Postosuchus was a large quadruped reptile that lived in the late Triassic. It was a ambush predator that ate anything from small dinosaurs to the large Pelycosaur that lived on the continent of Pangaea. Mainly a solo hunter they will fight other Postosuchus over territory and food. There is not much known about breeding but it is to be assumed that they lay eggs and once they are hatched the mother will stay by to keep them safe till they grown enough to be on there own like modern crocodiles and alligators. But once they are fully grown they are on there own.