Mounted replica of the fossilized skeleton of a juvenile Jobaria, a long-necked sauropod dinosaur that lived in Africa during the Early Cretaceous Period about 135 million years ago. As a juvenile, this individual was only 12.5.m long and stood just 5.5m at the hip whereas the adult jobaria was enormous, nearly 21.5 meters long, 14.5 meters high and estimated to have weighed over 18 metric tons (18,000 kg)!