In 2007, paleontologist David Evans was flying to the U.S. Badlands when he discovered reference to a "Barosaurus" skeleton (ROM 3670) in the collection of the Royal Ontario Museum in Toronto, where he had recently become a curator. Earl Douglass had excavated this specimen at the Carnegie Quarry in the early 20th century; the ROM acquired it in a 1962 trade with the Carnegie Museum. The specimen was never exhibited and remained in storage until its rediscovery by David Evans 45 years later. He returned to Toronto and searched the storage areas and found many fragments, large and small, of the skeleton. It is now a centrepiece of the ROM's dinosaur exhibit, in the James and Louise Temerty Galleries of the Age of Dinosaurs. At almost 27.5 meters (90 feet) long, the specimen is the largest dinosaur ever to be mounted in Canada. The specimen is about 40% complete. As a skull of "Barosaurus" has never been found, the ROM specimen wears the head of a "Diplodocus." Each bone is mounted on a separate armature so that it can be removed from the skeleton for study and then replaced without disturbing the rest of the skeleton. (See video "Dino Workshop" at reference.) In the rush to put the dinosaur on exhibit within ten weeks of its delivery to Research Casting International in 2500 pieces, not all of the skeletal fragments were mounted. In addition, more bones labeled ROM 3670 are still being found in storage. In future, more may be added to the specimen and it may turn out to be the most complete known.' (See video "Dino Assembly" at reference.) The ROM specimen is nicknamed "Gordo." John McIntosh believes that the ROM's skeleton is the same individual represented by four neck vertebrae labelled "CM 1198" in the collection of the Carnegie Museum.