While often confused as dinosaurs, prehistoric reptiles that could fly (pterosaurs) and swim (plesiosaurs) are distinct from land-dwelling dinosaurs. This book highlights the unique characteristics of these flying and sea-dwelling creatures, demonstrating the diversity and adaptability of prehistoric reptiles. Scientists have learned how the structure of pterosaurs' wings allowed them to take flight and how some plesiosaurs came ashore to lay eggs while others gave birth to live young. Colorful images and fun facts will fascinate young readers.