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

A small dinosaur skull found in Montana 40 years ago was thought to be a young T. rex. Turns out it was a smaller, faster ...

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

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

Now, a research team says new evidence resolves the case. The latest clue comes from a complete skeleton — first uncovered in Montana in 2006 — that scientists say identifies the mystery reptile as ...

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

There are literally decades of research... based on a premise that this article overturns,” said one paleontologist.

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

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 ...

The new skeleton is dubbed ‘Dueling Dinosaurs’ because it was found intertwined with the bones of a Triceratops ...

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