The first Brachiosaurs skeleton was discovered in 1900 in Colorado by a collecting crew from the Field Museum of Natural History in Chicago, and was described and named in 1903 by Elmer Riggs. The skeleton was incomplete, so Riggs wasn’t sure exactly what Brachiosaurus looked like. Unfortunately, Brachiosaurus is a rare dinosaur. 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.