A dinosaur fossil thought to be a juvenile Tyrannosaurus rex is in fact a fully grown carnivore of a different species, according to researchers who believe they have finally settled a long-running ...

Is a mysterious, small tyrannosaur fossil from Montana just a juvenile? Or did tiny tyrannosaurs once walk the Earth? New research published in the journal Nature on October 30 offers evidence that ...

Paleontologists have long debated whether small tyrannosaurs were their own species or simply teenage T. rexes. This debate just got a major shake-up. Reading time 3 minutes Researchers claim to have ...

It's known as the "Dueling Dinosaurs" fossil: A triceratops and a tyrannosaur, skeletons entangled, locked in apparent combat right up until the moment of their mutual demise. Even in the Hell Creek ...

For decades, paleontologists have debated whether a small tyrannosauroid skull found in 1942 belonged to a juvenile T. rex or was a full-grown member of a previously unknown species, eventually dubbed ...