Sauropods were a group of large, long-necked dinosaurs that lived during the Mesozoic Era, primarily in the Jurassic and Cretaceous periods. They are known for their massive bodies, long tails, and elongated necks, which allowed them to reach high vegetation. Some of the most famous sauropods include Brachiosaurus and Diplodocus. These dinosaurs were herbivores, primarily feeding on leaves and plants. Their size provided them with protection from predators, and they often traveled in herds. Sauropods are among the largest land animals to have ever existed, with some species reaching lengths of over 100 feet.