Most other lineages of archosaurs went extinct at the end of the Triassic and dinosaurs did not.
- Although most groups had vanished by the end of the Triassic, dinosaurs, crocodiles, and pterosaurs managed to live and flourish during the Jurassic and Cretaceous eras.
- Different forms of locomotion emerged in the two branches of archosaurs. The Triassic saw the first widespread diversification of archosaurs.
- The pseudosuchians walk stretched out and have an ankle that is often crocodile-like and flexes in the middle to allow the foot to twist against the ankle.
- Although pterosaurs and other dinosaurs were extinct by the end of the Cretaceous, crocodiles and birds survived because they developed in the Late Jurassic.
- However, as shown in crocodiles, this ankle joint can also tighten, causing the animal to walk with a high gait.
- The ornithischians, on the other hand, are compelled to walk erect and put one foot in front of the other like birds because they have an ankle that swings in just one plane (fore and aft).
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