Tyrannosaurus rex, it turns out, may have taken its time becoming king. A new analysis of 17 tyrannosaur fossils suggests the ...

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 ...

Previous studies of T. rex growth rings concluded they grew until around the age of 25, and then stopped. This was more of a ...

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