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What unusual skull feature did Guanlong have?
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tyrannosaur
The fossilized remains of Sue, the most complete Tyrannosaurus rex skeleton in the world, on display at the Field Museum of Natural History, Chicago.
The Guanlong, which is the earliest well-known member of the tyrannosaur group, is distinguished by a unique and complex skull crest. This feature consists of a hollow bone that runs along the midline of its skull.1