The term "Long-Necked Dinosaur" typically refers to a group of dinosaurs known as sauropods. These dinosaurs are characterized by their long necks, which allowed them to reach high vegetation and feed on leaves from tall trees. Some well-known examples of sauropods include Brachiosaurus and Diplodocus. They lived during the late Jurassic and early Cretaceous periods. Sauropods were among the largest land animals to ever exist, with some species growing over 100 feet long. Their long necks were supported by strong vertebrae and muscles, enabling them to maintain their heads high above the ground. Despite their size, they were herbivores, primarily consuming plants.