They conceded that comparison with Tyrannosaurus was difficult due to the disarticulated state of the cranial bones of Giganotosaurus, but noted that at 1 meters , the femur of Giganotosaurus was 5 cm (2 in) longer than that of "Sue", the largest known Tyrannosaurus specimen, and that the bones of Giganotosaurus appeared to be more robust, indicating a heavier animal.