A strange lizard tooth found in 1885 turned out to be one of the first dinosaurs found in the United States. In 2017, its name was changed from Troodon formosus to Stenonychosaurus. Discover the ever-changing world of paleontology! This book is about the discovery of the Stenonychosaurus dinosaur, including information about the dinosaur's appearance, movement, and diet before it became extinct. This series introduces readers to the study of dinosaurs. Each book covers what scientists know and what they are still working to learn about these prehistoric beasts. Each book includes a glossary, comprehension questions, and an extension activity

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