User blog comment:Adsper/All Possible Mobs/@comment-2001:5B0:45C4:75D0:0:FF:FEBF:47C0-20180619180137/@comment-68.149.149.52-20180619200958

1)you are very correct that Tyrannosaurus rex has a maximum size of 40 ft (~12 metres) however, the holotype Giganotosaurus fossils most accurate reconstruction places it at the same size (12.25 m specifically).

2) that isolated jaw fragment indicates at the very most an animal 6% longer than the Holotype, witch is roughly 42 and a half feet long.

3)Tyrannosaurus was taller as well as heavier, and since in science size = mass Tyrannosaurus rex is in fact larger than Giganotosaurus (8400kg VS 6800kg FMNHPR2081 and MUCPv-Ch1 respectively.)