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

The Tyrannosaurus rex seemingly came out of nowhere tens of millions of years ago, with its monstrous teeth and powerful jaws dominating the end of the age of the dinosaurs. How it came to be is among ...

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 ...

For decades, paleontologists argued over the lone skull used to establish the distinct species Nanotyrannus. Was it truly a separate species or simply a juvenile Tyrannosaurus rex? A new paper ...

The closest known relative of the infamous Tyrannosaurus rex has been unearthed by paleontologists in New Mexico. The newly discovered Tyrannosaurus mcraeensis was found in New Mexico's Hall Lake ...

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

A formerly unknown relative of the most iconic of all dinosaurs, Tyrannosaurus rex, has been newly identified, according to a study released Thursday. The revelation adds a new clue that could help ...

DENVER (KDVR) — Details about the juvenile Tyrannosaurus rex fossil discovered by three boys in North Dakota are beginning to take shape at the Denver Museum of Nature and Science, including its size, ...