This plant eater was dangerous. It was about 9.9 meters (33 ft ).It lived about 70 to 65 million years ago. It had few teeth compared to the duckbills and horned dinosaurs. This wieghed almost 8 tons and was slow moving. It sniped plants with it's little leaf shaped teeth. Ankylosaurus tail could have broken bones of giant attackers.When Barnum discovered it, he thought it was a stegosaur.