The lystrosaurus itself was a rather mundane beast. Initially, it was a lumbering low slung dinosaur about the size of a pig. It walked with a "semi-sprawling gait," like an alligator. It had a beak, and big plates for teeth, and was herbivorous. It used its beak to nip off plants, which it ground between its plate teeth in a thoroughly pedestrian manner.
Lystrosaurus, in other words, was nothing special.
Until all the dinosaurs were wiped out, and it was the only thing left alive.
Now that's an exaggeration, of course, but not by much. At the end of the Permian age, a huge meteor wiped out almost all life on Earth. Everything died except for some insects, a handful of tiny rat-like proto-mammals, and the lystrosaurus.
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