Huge dinosaurs evolved different cooling systems to combat heat stroke
Different dinosaur groups independently evolved gigantic body sizes, but they all faced the same problems of overheating and damaging their brains.
Read moreTyrannosaurus Rex
T. rex used a stiff skull to eat its prey
A Tyrannosaurus rex could bite hard enough to shatter the bones of its prey. But how it accomplished this feat without breaking its own skull bones has baffled paleontologists. That's why scientists are arguing that the T. rex's skull was stiff much like the skulls of hyenas and crocodiles, and not flexible like snakes and birds as paleontologists previously thought.
Read moreWhat wolves' broken teeth reveal about their lives
An evolutionary biologist has spent more than three decades studying the skulls of many species of large carnivores — including wolves, lions and tigers — that lived from 50,000 years ago to the present. She reports today the answer to a puzzling question.
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