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

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

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

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

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

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 ...

The findings suggest T. rex spent much of its life as a juvenile or subadult, growing quickly in some years and barely at all ...

A study of fossil bones shows Tyrannosaurus rex kept growing until around age 40, challenging long-held ideas about dinosaur ...

India, Jan. 16 -- For decades, scientists have estimated the age and growth rate of Tyrannosaurus rex by counting annual ...

The largest-ever study of how the “king of dinosaurs” grew shows a much longer, slower path to adulthood than scientists ...