A group of researchers has estimated how long it took Tyrannosaurus rex to reach its full size — and the time period is ...

By counting visible and hidden rings, researchers found that T. rex did not reach full size until 35 to 40 years of age.

Pioneering techniques used in this research may soon be applied to other dinosaur fossils and alter the course of ...

Tyrannosaurus rex is arguably the world’s most famous dinosaur, yet paleontologists are still learning more about this giant ...

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

By cutting into a tiny throat bone, Princeton's Chris Griffin showed that it belonged to an adult of a smaller tyrannosauroid ...

A recent study reveals that the Tyrannosaurus rex dinosaur grew more slowly and lived longer than previously believed, altering our understanding of this iconic species.

There is no question that Tyrannosaurus rex got big. In fact, this fearsome dinosaur may have been Earth's most massive land ...

Fewer Tyrannosaurus rex fossils are available for scientific research because wealthy people are purchasing them for private collections, a new study has found. "The early growth stages of T. rex are ...

Tyrannosaurus rex is still the biggest, baddest land predator of all time. It was the size of a city bus, with a head almost as long as Tom Cruise is tall and a smile every bit as devastating.

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 ...