Classification: Reptilia, Ornithischia
Body length: 9 m
Body weight: 6 t
Period: End of the Cretaceous
Location: Western North America
Its entire top side was heavily protected from carnivores with thick, oval plates embedded (fused) in its leathery skin, 2 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. Ankylosaurus had four short legs (the rear legs were larger than the front legs), a short neck, and a wide skull with a tiny brain. This huge, extremely heavy reptile was an herbivore (it ate only plants). It had to eat a huge amount of low- lying plant material to sustain itself so its gut must have been very large.