The Truth About T. rex's Lips: Research Reveals Surprising Findings.
New research by an international team, including Thomas Cullen, an associate professor of paleobiology at Auburn University, suggests that therapod dinosaurs like Tyrannosaurus rex would have had fleshy lips covering their teeth instead of those menacing mandibles. The researchers examined tooth wear, the size and scale of therapod skulls and teeth, and compared T-rex skulls to those of modern-day lizards and crocodiles. The results of the comparison were published in the journal Science on Thursday. However, some paleontologists have found the study "completely unconvincing."