Add Yahoo as a preferred source to see more of our stories on Google. For decades, paleontologists have debated whether Tyrannosaurus rex was the sole apex predator of the end-Cretaceous. According to ...

Scientists have long puzzled over the origins of a mysterious dinosaur excavated in the 1940s: Was it a young T. rex or another type of dinosaur? At first, researchers had only a tyrannosaur skull to ...

The debate over Nanotyrannus’ identity is finally over. A remarkably preserved fossil proves it was a mature species, not a teenage T. rex. This discovery rewrites how scientists understand ...

More than half of the world's scientifically useful T. rexes are in the hands of private or commercial owners, and not accessible to scientists, according to research. Reading time 3 minutes ...

For many years, paleontologists have debated about whether there was a smaller relative of the Tyrannosaurus rex, or if those smaller fossils were really just awkward teenage versions of the king of ...

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 ...