Some helmet headsSome ankylosaurs like Euoplocephalus had bony helmets for head coverings. This plated protection even extended to the eyes, which had bony "awnings" above them.

Some tail weaponsNot all ankylosaurs had clubs on the ends of their tails, but many packed heavy weapons. The massive bony club on the end of Euoplocephalus's tail would have made a lasting impression on an attacker who approached from the rear.

Bird bones inside?It's hard to picture any similarity between armored dinosaurs and birds by looking at the outside of the animal. However, by studying their skeletons, scientists know that both birds and ankylosaurs have the same type of hip structure. Ornithischians, or "bird-hipped" dinosaurs, have a structure in which the two lower pelvic bones pointed backward and down. The saurischians or "lizard-hipped" dinosaurs, on the other hand, have a hip structure in which one of the lower pelvic bones pointed forward and one pointed backward.