A recent theory that has abounded in paleontological communities since last year (mostly inspired by the research that went to into portraying T.rex in a new video game called Saurian) was that tyrannosaurs had lips that fully encased their teeth when they closed their mouths. The explanation was that their enamel-covered teeth needed to be coated in fluid constantly to prevent them from degrading.
However, some well preserved skull fossils from a new species of Daspletosaurus may have disproved the lip theory:
Interesting. I mean this is only for Daspletosaurus, other tyrannosaurs and predatory dinosaurs, or just dinosaurs in general could still have had lips. This does raise the question whether or not these modern day ideas like a feathered and lipped rex are legit or not.
"...I hope they remember you."-Thanos
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