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

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 ...

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

A provocative study published earlier this year proposed that the world's best-known and perhaps best-loved dinosaur, Tyrannosaurus rex, was actually three separate species. Not so fast, says new ...

Almost everyone has heard of Tyrannosaurus rex, but how much do you actually know about this iconic dinosaur predator? Take our quiz to find out.

T. rex may not be the king of dinosaurs after all. An unearthed skull has revealed a close relative of the T. rex that may have been even larger than the previously-crowned apex predator. A study, ...

The jaw fossil for Tyrannosaurus mcraeensis has key distinctions from T. rex. Paleontologists have discovered a new species of dinosaur that could be the closest-known relative of the famed ...

One hundred years of Tyrannosaurus rex : the skeletons / Neal L. Larson -- Wyoming's Dynamosaurus imperiosus and other early discoveries of Tyrannosaurus rex in the Rocky Mountain West / Brent H.

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