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.

When you hear the word "dinosaur," the first thing that might spring to mind is a hulking skeleton like Sue the T rex in ...

The behemoth dinosaurs grew more slowly and had longer lifespans than previously thought, a new study suggests ...

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

By Will Dunham WASHINGTON, Jan 15 (Reuters) - There is no question that Tyrannosaurus rex got big. In fact, this fearsome ...

For decades, scientists have been counting annual growth rings—similar to tree rings—inside fossilized leg bones of ...

Dinosaur bones are like trees—every year is represented by a new ring, and paleontologists can count those concentric circles ...

The largest-ever study of how the “king of dinosaurs” grew shows a much longer, slower path to adulthood than scientists ...

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

An analysis of growth rings in the leg bones of 17 Tyrannosaurus rex individuals reveals that the dinosaurs matured much more ...