Animal evolution is a complex subject, but in this title young readers will encounter easy-to-understand explanations on how birds went from flightless dinosaurs to soaring eagles in the sky. Ancient creatures, transition animals, and modern-day birds fly off the page with colorful images and QR codes throughout the book. DiscoverRoo is an imprint of Pop!, a division of ABDO. Aligned to Common Core standards & correlated to state standards.