Ankylosaurus magniventris was a type of armoured dinosaur. It was the largest of its type, with a maximum length of 8 metres (26 feet) and height of 2 metres (6 feet).
The body was broad and low-slung and covered in armour. Carnivores, attacking from above, would find no weak points, and the animal could defend itself by using its clubbed tail.
Ankylosaurus was a herbivore, like all ankylosaurs. It probably ate ferns and cycads, which were common low-growing plants.