A new study suggests that predatory dinosaurs, such as Tyrannosaurus rex, did not have permanently exposed teeth as depicted in films such as Jurassic Park, but instead had scaly, lizard-like lips covering and sealing their mouths.
Tyrannosaurus rex walked surprisingly slowly, new study finds
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T. Rex Revisited: Fast, Slow, or Pack Hunter?
Tiny Tyrannosaur Hints at How T. Rex Became King - The New York Times
Was the T-rex really at the top of the food chain during its time on Earth? - Quora
Has T. rex lost its bite? Menacing snarl may be wrong
Predatory dinosaurs such as T. rex sported lizard-like lips
