Ankylosaurus was a huge armoured dinosaur, measuring about 25-35 feet (7.5-10.7 m) long, 6 feet (1.8 m) wide and 4 feet (1.2 m) tall and it weighed roughly 3-4 tons.
Its entire top side was heavily protected from carnivores with thick plates embedded in its leathery skin, Â rows of spikes along its body, large horns that projected from the back of the head, and a club-like tail. It even had bony plates as protection for its eyes. Only its under-belly was unplated. Flipping it over was the only way to wound it.
The name Ankylosaurus means ‘fused lizard’.
Ankylosaurus lived at the end of the Cretaceous Period (around 66 million years ago). They were one of the last dinosaurs remaining before the large extinction event that occurred around this time.