Lystrosaurus is a smallish dicynodont that lived at the end of the Permian period, which ended in spectacular fashion with the largest mass extinction in Earth’s history (so far). Most of its contemporaries succumbed to this catastrophe, but Lystrosaurus survived and inherited a world largely devoid of predators or competitors. Fossils of Lystrosaurus are thus quite abundant in rocks from the start of the subsequent Triassic period.
