This Collector's Set includes three volumes -- Animals, Dinosaurs, and Why? -- providing fascinating, level-appropriate facts alongside bright and colorful photographs and illustrations. Inspired by the award-winning National Geographic Little Kids magazine, the Little Kids First Big Book Collector's Set is a visually compelling and approachable set of first reference books for 4- to 8-year-olds. Each book encourages interactivity, satisfies curiosity, and launches kids into a lifetime of exploration!