Their whole splendid world, built on bones that were hollow and with paper-thin walls, has long since collapsed into dust. Scarcity is especially the rule for Quetzalcoatlus, which is known from ...

"Pterosaur bones are very delicate ... Cryodrakon boreas rivaled Quetzalcoatlus as the largest of the pterosaurs that inhabited North America at the time. Both Cryodrakon boreas and Quetzalcoatlus ...