Tyrannosaurus rex may have taken far longer to grow up than scientists once thought. By analyzing growth rings in fossilized leg bones from 17 tyrannosaur specimens and using new statistical methods, ...

For decades, scientists have been counting annual growth rings—similar to tree rings—inside fossilized leg bones of Tyrannosaurus rex to estimate how old the giant carnivores were when they died and ...

For years, scientists believed that Tyrannosaurus rex reached its adult size by age 25, based on counts of annual growth rings inside fossilised leg bones. Now, a comprehensive study of 17 tyrannosaur ...

Tyrannosaurus rex is often called the scariest and most feared dinosaur to ever walk the Earth, but science still debates what that reputation truly means. Fossils reveal crushing bite power, a ...

The largest-ever study of how Tyrannosaurus rex grew shows a much longer, slower path to adulthood than scientists previously thought. For decades, scientists have been counting annual growth ...