Kyle Atkins-Weltman, who is studying anatomy and vertebrate paleontology at Oklahoma State University, was examining a set of dinosaur fossils identified as Anzu wyliei for a school project when he noticed the bones seemed unusually small for the species. “It took me at least maybe two or three days to really wrap my head around that because it was just so serendipitous,” Atkins-Weltman told The Washington Post. E. infernalis’ bones were originally labeled as belonging to Anzu wyliei, a dinosaur nicknamed the “chicken from hell,” and were found in the Hell Creek Formation, which covers parts of Montana, Wyoming, North Dakota and South Dakota.