Tyrannosaurus rex lived longer and took more time to reach its maximum size than previously thought, according to a new study.

A study of fossil bones shows Tyrannosaurus rex kept growing until around age 40, challenging long-held ideas about dinosaur ...

Dinosaur bones are like trees—every year is represented by a new ring, and paleontologists can count those concentric circles to determine a fossil’s age. Previous estimates put T. rex’s lifespan at ...

It's known as the "Dueling Dinosaurs" fossil: A triceratops and a tyrannosaur, skeletons entangled, locked in apparent combat right up until the moment of their mutual demise. Even in the Hell Creek ...