Palaeontologists have argued for decades over whether certain fossils are young Tyrannosaurus rex or another species entirely ...

Now a research team said there’s new evidence that resolves the case. The latest clue comes from a complete skeleton — first ...

How did these different dinosaur species interact? Did they hunt different prey? What did T. rex adolescence really look like ...

A new analysis of fossils believed to be juveniles of T. rex now shows they were adults of a small tyrannosaur, with narrower jaws, longer legs, and bigger arms than T. rex. The species, Nanotyrannus ...