More information: Rogers C.C. Buntin et al, A new theropod dinosaur lek in the Cretaceous Dakota Sandstone (Dinosaur Ridge, Colorado, USA), Cretaceous Research (2025). DOI: 10.1016/j.cretres.2025. ...

A new dinosaur species, Enigmacursor mollyborthwickae, has been identified from a partial skeleton found in Moffat County, Colorado, researchers said.

The 150-million-year-old specimen is valued at up to $6 million by Sotheby’s. Some paleontologists worry this auction and earlier ones are driving fossil market speculators.

What dinosaur has 500 teeth? This prehistoric jaw was one-of-a-kind. This dinosaur’s skull was light as air but its mouth was packed with power—and a unique ability to quickly grow teeth.

But for two species of dinosaur, the opposite was true. This is the story of how they allied together to fend off predators in their march towards the Arctic Circle.