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.