He bought what he thought were the bones of a juvenile "chicken from hell" dinosaur (officially known as Anzu wyliei).

Artist’s depiction of Eoneophron infernalis (top left), MOR 752 (bottom left), and Anzu wyliei (right) in the Hell Creek Formation. Illustration by Zubin Erik Dutta. Disclaimer: AAAS and EurekAlert!

"With the discovery of A. wyliei, we finally have the fossil evidence to show what this species looked like and how it is related to other dinosaurs." Anzu had the build of a fast runner and with ...