Caption:
20040908 - Canada - Alberta : Royal Tyrrell Museum Parasarolophus One of the rarest duckbills, Parasaurolophus also possessed the most distinctive crest. hasal passages extended through the crests of many duckbill dinosaurs. They may have functioned as resonatiog chambers, producing honks and bellows distinctive to each species. Parasaurolophus walkeri latecretaceou, Dinosaur Provincial Park, Alberta Caption word by Royal Tyrrell Museum