: Bony tendons that crisscrossed the vertebrae to stiffen the tail and back for stability. Hall of Ornithischian Dinosaurs | AMNH
: A backward-pointing pubis bone, parallel to the ischium, likely evolved to accommodate a larger digestive system for processing plants. ornithischian dinosaur
: A unique, beak-like bone at the tip of the lower jaw used for cropping vegetation. : Bony tendons that crisscrossed the vertebrae to