Delta Is for Dinosaur By Mike Manefield • Illustrated by Tallulah Cunningham What if the most important creature in the history of life on Earth… was a bacterium? Over a billion years ago, a playful little cell named Delta bounced into its friends in the gooey swamp of early Earth—and accidentally changed the course of evolution forever. Based on real science, Delta Is for Dinosaur tells the incredible true story of how life leapt forward thanks to an ancient bacterial game of bumper cars. With dazzling illustrations and easy-to-understand language, this book introduces young readers to the groundbreaking idea of endosymbiosis —the moment one cell started living inside another, giving rise to the complex life that would one day become dinosaurs, birds, and even us. Perfect for curious kids aged 4–8, science-loving families, and classrooms exploring biology or the origins of life. Includes a fun, science-based explainer for grownups at the end!