Many predators protect their teeth from corrosion caused by air using lips, yet there was a new study published stating theropod dinosaurs from the tyrannosaurid family do not appear to have had them.
No lips anymore.
First of all the new discovery. The researchers certainly haven't put the claim "no lips" in the title... I know this isn't a strong argument just sain'
Secondly: using living relatives and a nearly realated group. Both living relatives, birds and crocodiles, do not have lips. Bird have toothless beaks, not in the need of protecting any teeth, and crocodiles simply don't have lips, being semi-aquatic creatures. However, there is a group of mostly carnivorous, fairly near realated creatures which do have snouts as well as beaks, and teeth in both of them: pterosaurs. We found soft tissue in all forms and shapes on them, from pulmonary airsacs to wing membranes, fuzzy integument and even head crests with preserved colouration,
"Personally, I never think of a fossil animal as being dead, but always picture it in my mind's eye as alive - an animated, breathing, moving machine, which stands, walks, fights or otherwise conducts itself after the fashion of a living creature."
Personal second favourite:
"only by practical means, and not by any mysterious hocus pocus, are pictures of fossil animals made possible."