Sauropods, or long-necked plant-eating dinosaurs, are the largest land animals that have ever lived, with the biggest species discovered so far, Patagotitan mayorum, weighing as much as twelve African elephants! Why did they grow so big, and what was the purpose of their long necks? 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.