T. rex's big, bare teeth? They may be a myth, study says - The Washington Post
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A new study in the journal Science is challenging some of the best-known depictions of dinosaurs in television and movies, saying the T. rex family had scaly lips covering their teeth.

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T. rex's big, bare teeth? They may be a myth, study says - The Washington Post

T.Rex did NOT have permanently exposed teeth - and instead had scaly, lizard-like LIPS, study finds

T-Rex May Have Had Lips Covering Up Its Teeth

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T. rex's big, bare teeth? They may be a myth, study says - The Washington Post

Fossil - Wikipedia

Tyrannosaur teeth were serrated like steak knives

Stegosaurus - Wikipedia
Tyrannosaurus rex had serrated teeth like steak knives to tear through their prey

T. rex May Have Had Lips
I've read that robust Tyrannosaurus specimens were female, is it possible that it is more a matter of age rather than sexual dimorphism? - Quora

How Did Birds Lose Their Teeth And Get Their Beaks? Study Offers Clues
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