Scientists have long debated whether a mysterious dinosaur excavated in the 1940s was a young T. rex or a distinct species.

Researchers say they have uncovered a case of mistaken identity and found evidence of a species called Nanotyrannus lancensis.

An analysis suggests Nanotyrannus is a separate, smaller dinosaur that lived alongside T. rex, settling a 30-year debate ...

An argument over whether fossils from several small dinosaurs represent a juvenile Tyrannosaurus rex or smaller adults of a ...

A paleontologist was trying to locate the site of a famous 1908 discovery when a rancher in Wyoming shared an important clue.

Governor Josh Stein, the North Carolina Museum of Natural Sciences and NC State University announced Thursday that the ...

Researchers think the dinosaur perished close to the sea, sank onto the seabed and was rapidly buried by minerals.

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 ...

In 1999, the world of palaeontology was electrified by what seemed to be the discovery of the century. It was a fossil that ...

Many of them — including a duck-billed dinosaur mummy discovered in 1908 — hail from an area in eastern Wyoming. In the new study, scientists returned to this so-called mummy zone and found new ...

Scientists say there’s new evidence that settles the origins of a mysterious dinosaur excavated in the 1940s. Researchers ...

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 ...