But one thing that did change rapidly with age was Caiuajara dobruskii's unusual bony head crest. The ridge jutted out from a large opening in the creature's skull, just in front of the eyes.
In younger animals, the crest was small and sloping. As they aged, the crests grew larger and more steep.
Caiuajara dobruskii might have been a migratory creature that only visited the southern Brazil locale occasionally, albeit consistently. But it's more likely, the authors said in the study, that flocks of the reptile lived there for many years. The individuals they discovered probably died during droughts or dessert storms.