Lindsay Zanno considering the work unconvincing and lacking in validity), it does bring up specimen BHI 6248 (nicknamed "E.D. While this theory has not seen widespread support (with other paleontologists like Dr. imperator) instead of just one based on size and morphological differences between various specimens (the idea being that the robustness of some specimens cannot simply be attributed to individual variation). Paul brings up the theory that there may be three Tyrannosaurus species ( T. This suggests that "Scotty" gained its exceptional size not due to age, but due to genetic factors, an abundance in resources, ideal environmental conditions, or a combination of these various factors. rex specimens, like 28 year-old FMNH PR 2081 (nicknamed "Sue" after American explorer and fossil collector Sue Hendrickson, who discovered the specimen in South Dakota on August 12, 1990), were smaller than him. rexes found so far, thus implying a greater potential maximum growth size for the species, this does not explain how older T. While evidence suggests that "Scotty" is actually one of the youngest and least mature of the adult T. The largest known Tyrannosaurus is specimen RSM P2523.8 (nicknamed "Scotty" after the celebratory bottle of scotch shared by the team that discovered the specimen), which achieved a length of 13 meters (43 feet) and a mass of almost 9 metric tons (10 short tons), though it should be noted that "Scotty" is an exceptionally-large individual, and most T. Previous calculations estimated lengths of up to 14 meters, but these measurements are now considered outdated overestimates in the light of more recent studies, which estimate an average of 3.66 - 4 meters (12 - 13 feet) in height, 12.3 - 12.4 meters (40 - 41 feet) in length, and 7 - 8 metric tons (7.7 - 8.8 short tons) in weight. Tyrannosaurus rex is the last, largest, and most heavily-built of the tyrannosaurs, a group of massive predators that dominated their respective ecosystems during the Late Cretaceous Period. 3.1 Hunting Tactics and Feeding Preferences.
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