Each book in the DK Readers series is specially crafted to suit the interests and learning stage of beginning readers. The five levels progress from easy-to-follow stories with simple sentences and word repetition to more sophisticated storylines, sentence structure, and vocabulary as children enjoy full-color photographs, sidebars and definition boxes, and lots of exciting information about the topics they love.Each book in the DK Readers series is specially crafted to suit the interests and learning stage of beginning readers. The five levels progress from easy-to-follow stories with simple sentences and word repetition to more sophisticated storylines, sentence structure, and vocabulary as children enjoy full-color photographs, sidebars and definition boxes, and lots of exciting information about the topics they love.