A new study reveals Tyrannosaurus rex took 40 years to reach full size, not 30, as previously thought. Researchers analyzed ...

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

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

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 ...

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

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