Lystrosaurus

Lystrosaurus was a dicynodont that lived in the early Triassic period.

Facts
Lystrosaurus lived in monster sized herds amd these species did better than any other at surviving. After surviving the mass permian exticntion these creatures had little to compete against so their population grew.

In other media
Lystrosaurus was shown in the last and final episode walking with monsters, classh of the titans. The second half of the episode was about a giant lystrosaurus herd migrating.