Apatosaurus vs Tyrannosaurus Rex
A detailed side-by-side comparison of Apatosaurus and Tyrannosaurus Rex, covering size, diet, classification, geologic period, and discovery history.
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| Property | Apatosaurus | Tyrannosaurus Rex |
|---|---|---|
| Scientific Name | Apatosaurus ajax | Tyrannosaurus rex |
| Classification | Sauropoda | Tyrannosauridae |
| Period | Jurassic Late | Cretaceous Late |
| Diet | Herbivore | Carnivore |
| Length | 22.0 m | 12.3 m |
| Height | 4.5 m | 3.7 m |
| Weight | 22.7 t | 8.4 t |
| Discovery Year | 1877 | 1905 |
| Discovery Location | Morrison Formation, Colorado, USA | Montana, USA |
| Named By | Othniel Charles Marsh | Henry Fairfield Osborn |
Size Comparison
about as long as 4 cars end-to-end
about as long as 2 cars end-to-end
Weight Comparison
about the weight of 3.8 elephants
about the weight of 1.4 elephants
Timeline Comparison
Diet Comparison
Apatosaurus
HerbivoreApatosaurus was a plant-eater, feeding on vegetation like ferns, conifers, and cycads.
Tyrannosaurus Rex
CarnivoreTyrannosaurus Rex was a meat-eating predator, hunting other animals for food.
Classification Comparison
Apatosaurus
Tyrannosaurus Rex
Did You Know?
Apatosaurus was about 1.8x longer than Tyrannosaurus Rex.
Apatosaurus weighed roughly 3x more than Tyrannosaurus Rex.
Apatosaurus was a herbivore while Tyrannosaurus Rex was a carnivore.
Apatosaurus lived during the Jurassic Late while Tyrannosaurus Rex lived during the Cretaceous Late, separated by roughly 44 million years.
Apatosaurus was discovered 28 years earlier, in 1877.
Apatosaurus belonged to Sauropoda while Tyrannosaurus Rex belonged to Tyrannosauridae.
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