Until now, estimating how old a dinosaur was when it died has been a fairly simple process: Count up the growth rings in the ...

The largest study ever conducted on the growth of Tyrannosaurus rex reveals that the dinosaur took a far longer and slower route to adulthood than scientists had previously believed.

Add Yahoo as a preferred source to see more of our stories on Google. Tyrannosaurus rex is known as the king of the dinosaurs. - Roger Harris/Science Photo Library RF/Getty Images Tyrannosaurus rex ...

Tyrannosaurus rex lived longer and took more time to reach its maximum size than previously thought, according to a new study.Scientists have long counted annual growth rings in fossilized ...