Sauroposeidon
The neck length of Sauroposeidon is estimated at , compared to a neck length of  for the HM SII Giraffatitan. This is based on the assumption that the rest of the neck has the same proportions as Giraffatitan, which is a reasonably good conjecture.Sauroposeidon was probably able to raise its head  above the ground, which is as high as a six-story building. In comparison, Giraffatitan could probably raise its head  into the air.Sauroposeidon's shoulder height has been estimated at  based on an interpretation of the animal as a brachiosaurid. Estimates of its total possible length have ranged from  to .Wedel, Mathew J; Cifelli R.L. and Sanders R.K. 2000. Sauroposeidon proteles, a new sauropod from the early Cretaceous of Oklahoma. Journal of Vertebrate Paleontology 20 (1): 109–114.