For decades, paleontologists argued over the lone skull used to establish the distinct species Nanotyrannus. Was it truly a ...

By Stephen Beech A fossil skull found 83 years ago originally thought to be a teenage Tyrannosaurus rex actually comes from a separate species of tyrannosaur, according to new research. Scientists, ...

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 ...

To describe the essence of Tyrannosaurus rex, the most terrifying predator that ever lived, University of Chicago paleontologist Paul Sereno offers this: “Jaws on fast-running legs.” The monster had ...