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Temporal range: Late Triassic – Early Cretaceous
This bizarre suite of teeth has led to debate over what heterodontosaurs ate. Some scientists think heterodontosaurs were omnivores who used their differently-shaped teeth to eat both plants and small animals.
Though it is mostly bi-pedal it was semi-quadrupedal if it needed it's front legs. It was 18 inches high and 40 inches long. It was a very light weighted dinosaur weighing in at only ten pounds.