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 ...

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

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 ...

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 ...

WOODLAND PARK, Colo. — A piece of history has found itself in the present thanks to the help of some modern technology, the skull of a rare and new genus of Tyrannosaur has been 3D printed into ...

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 ...

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

A new specimen of one of the most controversial species of dinosaur has the potential to overturn decades of research on the ...

T. rex's story has been turned on its head by a new discovery about one of the world's most famous fossil finds. One of the ...

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