Brontosaurus
"Brontosaurus" was a large, long-necked quadrupedal animal with a long, whip-like tail, and forelimbs that were slightly shorter than its hindlimbs. The largest species, "B. excelsus", weighed up to and measured up to long from head to tail. For comparison, the current largest land animal, the average male African bush elephant is 3.20 m (10.5 ft) tall at the shoulder and has a body mass of 6,000 kg (13,228 lb) or 6.6 short tons.
William May (artistic director)
He chose Sonny Tilders, one of the film and television industries' leading professionals in the field of animatronic puppetry, to head the development of the dinosaurs. May designed the fifteen life-size dinosaurs used in the production. Ten species of dinosaurs are included in the show, including the Liliensternus, Plateosaurus, Allosaurus, Stegosaurus, Utahraptor and Torosaurus. The largest dinosaur in the production, the Brachiosaurus, which most resembles the cranes which inspired the show, measures 56 feet long and 36 feet tall.