Sauropelta is a ankylosaur from the mid cretaceous period.  Compared to other cretures of this time, this walking tank is covered in spikes and a bony armoured back.  It was a slow moving herbivore and had very few predators.  If this tank is knocked over to its back it is game over this creature.  It lived in North America during the time with a heavy weight predator Acrocanthosaurus and the light weight predator Deinonychus.  It would ate low lined plants compared to the other herbivores.