Camarasaurus is a genus of sauropod dinosaurs that lived in North America 150 million years ago. The maximum size of the largest species, C. supremus, reached a maximum length of 23 meters (75 ft) and maximum estimated weight of 51.8 tons. Serving the purpose of weight-saving, as seen in other sauropods, many of the vertebrae were hollowed out or pneumatic, riddled with passages and cavities for an intricate system of air sacs connected to the lungs. This feature was relatively unknown at the time Camarasaurus was discovered, and was the inspiration for its name, meaning "chambered lizard". The strong, robust teeth of Camarasaurus in particular were more developed than those of most sauropods, indicating that it may have processed food in its mouth to some degree before swallowing. Camarasaurus is among the most common and frequently well-preserved sauropod dinosaurs.
In the late Jurassic segment, 2 Dryosaurus hide under a Camarasaurus from a Ceratosaurus. Later, some more Camarasaurus feed upon the trees, while the Dryosaurus pick their scraps of tree leaves. Lastly, some head to the river.