CBC Radio’s Quirks & Quarks has a great segment about Nanotyrannus. There’s an interview with James Napoli of Stony Brook University, who was coauthor on “Nanotyrannus and Tyrannosaurus coexisted at the close of the Cretaceous”, which was published in the journal Nature.

Small tyrannosaur fossils belonging to a dinosaur about half the size and a tenth of the mass of other Tyrannosaurus rex fossils have been puzzling scientists for years. A new study, co-led by James Napoli at Stony Brook University, has finally revealed that they’re not just young T. Rexes, as was previously suspected, but an entirely new species. The research was published in the journal Nature.