Camarasaurus is one of the most famous and abundant of the long necked dinosaurs. Camarasaurus is a sauropod from the Late Jurassic, Morrison Formation of North America. The Camarasaurids had the largest skulls of all of the sauropods, however their neck and tail were not as long as some of their popular cousins. Adult Camarasaurs were generally 35 to 55 feet (10 - 17 m) long, weighed around 18 tons (16 tonnes) and stood between 10 and 15 feet (3 - 4.5 m) tall at the hips.

This is the right side of the lower jaw from the Camarasaurus nicknamed "ET". The skull is from a nearly complete Camarasaurus skeleton from the famous Howe Stephens Quarry near Greybull WY. The lower jaw shows all stages of teeth coming in, along with some teeth ready to shed. It is from a small, yet fully grown, Camarasaurus whose species has not yet been described. The original skull and skeleton are on display at the Saurier Museum in Aathal, Switzerland.