Scientists have long debated whether a mysterious dinosaur excavated in the 1940s was a young T. rex or a distinct species.

The Dueling Dinosaurs fossil contains two dinosaurs preserved together in a potential predator-prey encounter.

A tiny, reptilian fossil has been excavated from layers of ancient sandstone, where it was preserved for over 240 million years – predating the dinosaurs. The little lizard-like creature pinches the ...