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

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

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

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

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

The prehistoric Tyrannosaurus rex didn’t balloon to its massive size as quickly as scientists once believed. Instead, the ...

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

A duckbill dinosaur%27s fossilized skull and hide bear healed marks of a predator attack The healed bite marks look like they came from a Tyrannosaurus Rex The find represents the first unequivocal ...

A new giant dinosaur was recently discovered in the Patagonia region of Argentina with short arms reminiscent of a Tyrannosaurus rex. Like the T. rex, which was one of the largest dinosaurs to have ...