In the past, analysis of Tyrannosaurus rex bones suggested that the enormous dinosaurs died by the age of 30. But a new study of T. rex leg bones suggests that they may have lived longer than ...

NEW YORK (AP) — Scientists have long puzzled over the origins of a mysterious dinosaur excavated in the 1940s: Was it a young T. rex or another type of dinosaur? At first, researchers had only a ...

Blood vessel structures found preserved in a famous T rex fossil are helping scientists understand how dinosaurs healed from injuries. A study published recently in the journal Scientific Reports ...

Add Yahoo as a preferred source to see more of our stories on Google. This illustration shows a Late Cretaceous face-off between an adult Nanotyrannus (left) and two juvenile T. rex, with a sub-adult ...