FMNH PR 2081 ("Sue")
Tyrannosaurus rex • “Tyrant Lizard King”
Tyrannosaurus rex was one of the largest terrestrial carnivores of all time, roaming western North America just prior to the Cretaceous-Paleogene extinction event. With…
MLP-DP 01-XII-10-1 / PVPH-1 reconstructed skeletal mount
Argentinosaurus huinculensis • “Argentine lizard of Plaza Huincul”
One of the largest land animals in Earth history, this colossal titanosaur shook the Cretaceous plains of South America with dorsal vertebrae measuring over…
Tyrannosaurus rex and Argentinosaurus huinculensis were both Cretaceous dinosaurs. They were separated by roughly 24 million years of deep time and never encountered one another in the ancient world. Tyrannosaurus rex was an adapted carnivore, whereas Argentinosaurus huinculensis was a herbivore, representing fundamentally distinct ecological roles. Based on available fossil estimates, Argentinosaurus huinculensis was larger than Tyrannosaurus rex in both overall length and estimated body mass (approximately 8.33× heavier and 2.85× longer). Estimates vary between individual specimens.
Anatomical dimensions compared on a shared proportional baseline against an adult human (1.8 m / 5.9 ft).
Argentinosaurus huinculensis was longer by approximately 22.7 m.
Argentinosaurus huinculensis stood taller by approximately 11.3 m.
Argentinosaurus huinculensis had a greater estimated mass by 61.6 tonnes.
Based on available fossil estimates, Argentinosaurus huinculensis was larger than Tyrannosaurus rex in both overall length and estimated body mass (approximately 8.33× heavier and 2.85× longer). Estimates vary between individual specimens.
Paleontological Note on Mass Estimates: Dinosaur body weights are derived through volumetric laser scanning and femoral circumference scaling equations. Because soft tissue does not fossilize directly, mass values carry statistical margins of uncertainty and represent scientific estimates rather than exact weights.
Direct answers to the most important comparative questions about how these two prehistoric species differed.
Based on available fossil estimates, Argentinosaurus huinculensis was larger than Tyrannosaurus rex in both overall length and estimated body mass (approximately 8.33× heavier and 2.85× longer). Estimates vary between individual specimens.
Tyrannosaurus rex was an adapted carnivore, whereas Argentinosaurus huinculensis was a herbivore, representing fundamentally distinct ecological roles.
Tyrannosaurus rex lived during the Cretaceous (Late Cretaceous, 68–66 Ma), while Argentinosaurus huinculensis lived during the Cretaceous (Late Cretaceous, 96–92 Ma).
Fossils of Tyrannosaurus rex were recovered from Western North America (Montana, South Dakota, Wyoming, Alberta, Saskatchewan), whereas Argentinosaurus huinculensis was discovered in Neuquén Province, Argentina.
Tyrannosaurus rex had a bipedal locomotion, contrasted with Argentinosaurus huinculensis which had a quadrupedal stance.
Tyrannosaurus rex and Argentinosaurus huinculensis did NOT live at the same time. They were separated by an immense temporal gulf of approximately 24 million years. Argentinosaurus huinculensis lived and went extinct tens of millions of years before Tyrannosaurus rex ever evolved.
Side-by-side catalog of verified anatomical measurements and geological records.
| Scientific Parameter | A Tyrannosaurus rex | B Argentinosaurus huinculensis |
|---|---|---|
| Scientific Binomial | Tyrannosaurus rex | Argentinosaurus huinculensis |
| Name Meaning | “Tyrant Lizard King” | “Argentine lizard of Plaza Huincul” |
| Taxonomic Clade / Group | Theropods | Sauropods |
| Geological Period | Cretaceous | Cretaceous |
| Fossil Time Range | Late Cretaceous, 68–66 Ma | Late Cretaceous, 96–92 Ma |
| Diet & Trophic Guild | Carnivore | Herbivore |
| Maximum Length | 12.3 m (40.4 ft) | 35 m (114.8 ft) |
| Standing / Hip Height | 3.7 m (12.1 ft) | 15 m (49.2 ft) |
| Estimated Body Mass | 8.4 tonnes (8,400 kg) | 70 tonnes (70,000 kg) |
| Locomotion / Stance | Bipedal | Quadrupedal |
| Geographic Localities | Western North America (Montana, South Dakota, Wyoming, Alberta, Saskatchewan) | Neuquén Province, Argentina |
| Geological Formation | Hell Creek Formation, Lance Formation, Scollard Formation | Huincul Formation |
| Discovery History | Barnum Brown (1902); described by Henry Fairfield Osborn (1905) (1902) | Historical holotype |
Visualizing both species across the 186-million-year span of the Mesozoic Era.
Tyrannosaurus rex and Argentinosaurus huinculensis did NOT live at the same time. They were separated by an immense temporal gulf of approximately 24 million years. Argentinosaurus huinculensis lived and went extinct tens of millions of years before Tyrannosaurus rex ever evolved.
Deep-time perspective: Tyrannosaurus rex and Argentinosaurus huinculensis were separated by approximately 24 million years. A visitor encountering one would have had no concept of the other.
Comparing the rock strata, paleoclimates, and ancient landscapes where their fossils were entombed.
Western North America (Montana, South Dakota, Wyoming, Alberta, Saskatchewan)
North America
Neuquén Province, Argentina
South America
Stratigraphic Synthesis:
Direct comparisons between extinct animals are inherently shaped by the incomplete nature of the fossil record. Skeletal dimensions reflect holotype or well-preserved paratype specimens, but individual ontogenetic age, sexual dimorphism, and intraspecific variation all influence the true living size of any prehistoric animal.
Body mass estimates shown above represent calculated averages from published volumetric models and biomechanical limb scaling. As modern synchrotron imaging and 3D digital skeletal mounts advance, museum measurements are continually refined.