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Happy #FossilFriday! Dinosaur skulls changed a lot as they grew from babies to adults. Here is a juvenile (#MOR548) and adult (#MOR549) #Hypacrosaurus stebingeri. Adults have a large crest on their head that may have been used for visual displays & vocalizations.

This is the skull of a nestling #Hypacrosaurus (#MOR548) - a #hadrosaur (duckbilled #dinosaur) from #Montana. A team led by Dr. Alida Bailleul found calcified cartilage in bones from this site that preserved cellular material including chemical markers for DNA!
#fossilfriday

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