Postosuchus was an archosaur ("ruling reptile"), a major group of living and extinct reptiles that includes crocodiles, dinosaurs, pterosaurs and birds. Postosuchus was on the line to crocodiles, but it was not a crocodile itself. Postosuchus evolved in the Late Triassic period. It was the top carnivore of the age. Its skull was short and broad, but it had a narrow snout and deep powerful jaws. Heavy-duty armour consisting of rows of plates covered its long back. It had a unique upright stance with straight legs directly beneath its body suggesting a quick and efficient runner. It is sometimes called a "running crocodile". It had longer back legs than front legs. Some palaeontologists believe it ran on two legs, but the majority think that it did so on four.
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