Parasaurolophus cyrtocristatus, Chicago Field Museum, Chicago, Illinois. Parasaurolophus cyrtocristatus was a duckbill dinosaur (ornithopod) from the Late Cretaceous Period where it was a North American herbivore in some 76-73 million years ago. There is still much speculation on the purpose of the huge crest ranging from thermoregulation to breeding and courtship-related ornamentation. Ironically, this one is hanging out by the exit sign.
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