Allosaurus vs Tyrannosaurus Rex
A detailed side-by-side comparison of Allosaurus and Tyrannosaurus Rex, covering size, diet, classification, geologic period, and discovery history.
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| Property | Allosaurus | Tyrannosaurus Rex |
|---|---|---|
| Scientific Name | Allosaurus fragilis | Tyrannosaurus rex |
| Classification | Theropoda | Tyrannosauridae |
| Period | Jurassic Late | Cretaceous Late |
| Diet | Carnivore | Carnivore |
| Length | 9.7 m | 12.3 m |
| Height | 3.5 m | 3.7 m |
| Weight | 2.3 t | 8.4 t |
| Discovery Year | 1877 | 1905 |
| Discovery Location | Garden Park, Colorado, USA | Montana, USA |
| Named By | Othniel Charles Marsh | Henry Fairfield Osborn |
Size Comparison
Allosaurus
9.7 m
roughly the length of a large SUV
Tyrannosaurus Rex
12.3 m
about as long as 2 cars end-to-end
Weight Comparison
Allosaurus
2.3 t
comparable to 2.3 small cars
Tyrannosaurus Rex
8.4 t
about the weight of 1.4 elephants
Timeline Comparison
Allosaurus
Tyrannosaurus Rex
Diet Comparison
Allosaurus
CarnivoreAllosaurus was a meat-eating predator, hunting other animals for food.
Tyrannosaurus Rex
CarnivoreTyrannosaurus Rex was a meat-eating predator, hunting other animals for food.
Classification Comparison
Allosaurus
Tyrannosaurus Rex
Key Differences
- Allosaurus (9.7 m, ~2,300 kg) was significantly smaller and lighter than T. rex (12.3 m, ~8,400 kg).
- Allosaurus lived 80 million years earlier in the Late Jurassic; T. rex was a Late Cretaceous predator.
- T. rex had a bone-crushing bite; Allosaurus had a weaker bite but likely used a hatchet-like strike with its upper jaw.
- Allosaurus had three-fingered hands with large claws; T. rex had vestigial two-fingered arms.
- Allosaurus was the apex predator of the Morrison Formation, hunting sauropods; T. rex dominated the Hell Creek ecosystem.
Did You Know?
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Tyrannosaurus Rex weighed roughly 4x more than Allosaurus.
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Both Allosaurus and Tyrannosaurus Rex were carnivores.
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Allosaurus lived during the Jurassic Late while Tyrannosaurus Rex lived during the Cretaceous Late, separated by roughly 44 million years.
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Allosaurus was discovered 28 years earlier, in 1877.
💡
Allosaurus belonged to Theropoda while Tyrannosaurus Rex belonged to Tyrannosauridae.
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