Palaeontologist Steve Brusatte takes readers on an enthralling journey through the evolutionary history of mammals. Starting with the humble beginnings of mammal ancestors during the age of dinosaurs, Brusatte chronicles how these small, nocturnal creatures survived mass extinctions and eventually rose to dominate the planet. Through vivid storytelling and cutting-edge scientific discoveries, he explores key developments such as the rise of warm-bloodedness, the evolution of fur and milk, and the diversification into the myriad forms we see today. From the mighty mammoths and sabre-toothed cats of the Ice Age to the emergence of humans, this book reveals the incredible story of how mammals became the rulers of the Earth.