Some experts claimed it was simply a young T. rex. Others argued it was a completely different animal. A new study answers ...

Debate kicked off in 1988 when a single small tyrannosaur skull discovered four decades earlier was given its own species ...

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

Now, a research team says new evidence resolves the case. The latest clue comes from a complete skeleton — first uncovered in ...

Scientists have long puzzled over the origins of a mysterious dinosaur excavated in the 1940s: Was it a young T. rex or ...

What if everything we know about T. rex growth is wrong? A complete tyrannosaur skeleton has just ended one of paleontology's ...

CANYON — The Panhandle-Plains Historical Museum (PPHM) announced this week that it has acquired a cast of a Tyrannosaurus rex skull, "a landmark addition to the paleontology collection," a news ...

The fossil skull of a mystery tyrannosaur has been the subject of debate since it was discovered in the 1940s.

Paleontologists have long debated whether small tyrannosaurs were their own species or simply teenage T. rexes. This debate ...

A fossil of two dinosaurs locked in battle shows the smaller of the pair wasn’t a young T. rex but a full-grown predator of ...

A new tyrannosaur species has just been found in Canada, and paleontologists say that it is the oldest Tyrannosaurus rex ever found in the country. Thanatotheristes degrootorium, who lived nearly 80 ...

Specifically, whether or not certain fossils found in Montana belonged to a young Tyrannosaurus rex or a completely separate, ...