In 1861, paleontologists unearthed a dinosaur fossil that looked like a bird! Archaeopteryx, as this species is known today, was a link between ancient dinosaurs and modern birds. In this guide, based on fundamental elementary science concepts, readers view amazing bird fossils and learn how they formed. Readers also learn how scientists know birds are descended from dinosaurs by comparing traits from both. Amazing photographs are paired with accessible text to make this book both educational and fun. Sidebars provide additional chances to dazzle young readers.