These dinosaurs were the prehistoric tanks of their time. Ankylosaurus magniventris was covered with hard, bony plates that offered superb protection from its most formidable predator—T. rex. Rows of spikes ran along Anklyosaurus's body, and small horns adorned its head to complete an impressive defense array.

Predators would have had to flip the squat, four-legged animal over, exposing its unprotected underbelly, to find a weak spot.