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

Now, a new study of 17 tyrannosaur specimens, ranging from early juveniles to massive adults, has revealed that the king of ...

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

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

A new analysis reveals Tyrannosaurus rex reached its full size only after four decades, overturning previous estimates and ...

New research shows Tyrannosaurus rex took nearly 40 years to reach full size, 15 years longer than previously believed, ...