Long-necked sauropod dinosaurs living in the Jurassic and Cretaceous. The last century, the early sauropod dinosaur fossils were first discovered, its neck was described as nearly level. But recently discovered fossils were re-erected : It's head is far above the ground, with swan-like curve of the neck is almost perpendicular to the ground. It also raises the blood circulation of such dinosaurs as the head to provide blood to the controversy, some researchers even think that it may be have more than one heart. The original fossil specimens are very heavy and fragile, difficult to move their joints, making it difficult to determine its initial shape of the neck. Steven and Parrish developed the DinoMorph software to simulate two kinds of long-necked Lizard foot dinosaur that forms the neck of Diplodocus and Apatosaurus. The software simulates the movement of each of the spine neck geometry details, has been a complex three-dimensional picture. The results show that the neck of their time is almost at the level of relaxation, a small downward-sloping angle. head off the ground very close to one another, compared with the neck down angle. two kinds of dinosaurs, the neck is not a traditional hypothesis considered to be as soft, Diplodocus only to the first Department of lifting more than the back, Apatosaurus flexibility slightly better. This means that the long-necked sauropod dinosaur along the lake to eat the plants growing in the ground, rather than to eat the leaves like giraffes.