Brachiosaurus was a large sauropod dinosaur that lived during the Late Jurassic (155-150 million years ago) in what is now western North America. Our Brachiosaurus toy accurately depicts this giant rare dinosaur, though it's much smaller than the real thing. History: Unfortunately, Brachiosaurus is a rare dinosaur, and very few additional bones have been found over the years, so the picture remains incomplete. Fortunately, skeletons of a closely related sauropod called Giraffatitan from Africa had the missing bones, so these were copied and added to the incomplete skeleton of Brachiosaurus, completing the puzzle. This composite skeleton was exhibited at the Field Museum of Natural history until it was moved to O'Hare International Airport to make room for "SUE", the famous Tyrannosaurus rex skeleton. Scientific Name: Brachiosaurus Characteristics: Brachiosaurus was one of the largest dinosaurs, about 85 feet (26 metres) in length, and weighed about 35 metric tons.