Postosuchus

Postosuchus was a fierce predator. It had long pointed teeth typical of carnivorous reptiles. Postosuchus walked on all four limbs. Rows of small bony plates in the skin of Postosuchus lined the backbone and protected it from predators. After Postosuchus became extinct, carnivorous dinosaurs became much bigger and came to dominate every continent. It was 6 metres long and weighed up to 300kg.