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Most estimates of Brachiosaurus altithorax's size are based on the related African brachiosaurid Giraffatitan (formerly known as Brachiosaurus brancai), which is known from much more complete material than Brachiosaurus. The two species are the largest brachiosaurids of which relatively extensive remains have been discovered. There is another element of uncertainty for the North American Brachiosaurus because the type (and most complete) specimen appears to represent a subadult, as indicated by the unfused suture between the coracoid, a bone of the shoulder girdle that forms part of the shoulder joint, and the scapula (shoulder blade). Over the years, the mass of B. altithorax has been estimated at 35. 0 metric tons (38. 6 short tons), 28. 3 metric tons (31. 2 short tons), 43. 9 metric tons (48. 4 short tons), 28. 7 metric tons (31. 6 short tons), 56. 3 metric tons (62. 1 short tons), and 58 metric tons (64 short tons). The length of Brachiosaurus has been estimated at 20–21 meters (66–69 ft) and 18 meters (59 ft), and its height at 9. 4 meters (31 ft) and 12–13 meters (39–43 ft).