Postosuchus is a large carnivore during the late Triassic. It appears as a main character during New Blood.
Postosuchus was the largest predator during it's time. It could walk on either four or two legs depending on the situation. It possessed a large maw capable of killing most prey or even it's own kind. This has more in common with other crocodilians than the dinosaurs that came after it.
It is seen going through the day in the life in New Blood. Where it hunts and gets wounded ultimately perishing due to it's wound.