Sauropods, or long-necked plant-eating dinosaurs, were the largest land animals that ever lived, with the biggest species discovered so far, Patagotitan mayorum, weighing as much as twelve African elephants! But why did they grow so big, and what was the purpose of their long necks? In this title, readers will learn about all different kinds of sauropods, their features, what they ate, their nesting sites, the herds they lived in, and more. Paleontologists who have discovered sauropod fossils all over the world are recognized.