Evolution of the Dinosaurs

Dinosaurs First Appear

What were other archosaurs like?

Archosaurs varied in many ways. Some, like the 1-foot-(30-centimeter-) long Gracilisuchus of the Middle Triassic could run on their hind legs over short distances; others, like the 12-foot-(4-meter-) long Chasmatosaurus, were heavy carnivores that walked on all fours. The 2-foot-(0.7-meter-) long Lagerpeton had very peculiar hind limbs: its feet had an elongated fourth toe that may have been used for perching.


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