Brachiosaurus vs Tyrannosaurus Rex

A detailed side-by-side comparison of Brachiosaurus and Tyrannosaurus Rex, covering size, diet, classification, geologic period, and discovery history.

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Side-by-Side Comparison

Property Brachiosaurus Tyrannosaurus Rex
Scientific Name Brachiosaurus altithorax Tyrannosaurus rex
Classification Sauropoda Tyrannosauridae
Period Jurassic Late Cretaceous Late
Diet Herbivore Carnivore
Length 26.0 m 12.3 m
Height 13.0 m 3.7 m
Weight 56.0 t 8.4 t
Discovery Year 1903 1905
Discovery Location Grand River Valley, Colorado, USA Montana, USA
Named By Elmer S. Riggs Henry Fairfield Osborn
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Size Comparison

Brachiosaurus 26.0 m

about as long as 5 cars end-to-end

Tyrannosaurus Rex 12.3 m

about as long as 2 cars end-to-end

Weight Comparison

Brachiosaurus 56.0 t

heavier than 9 African elephants

Tyrannosaurus Rex 8.4 t

about the weight of 1.4 elephants

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Timeline Comparison

Brachiosaurus
161.5 Mya Jurassic Late (Mesozoic) 145.0 Mya
Tyrannosaurus Rex
100.5 Mya Cretaceous Late (Mesozoic) 66.0 Mya
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Diet Comparison

Brachiosaurus

Herbivore

Brachiosaurus was a plant-eater, feeding on vegetation like ferns, conifers, and cycads.

Tyrannosaurus Rex

Carnivore

Tyrannosaurus Rex was a meat-eating predator, hunting other animals for food.

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Classification Comparison

Brachiosaurus

Clade: Sauropodomorpha

Group: Sauropoda

(Lizard feet)

Tyrannosaurus Rex

Clade: Theropoda

Group: Tyrannosauridae

(Tyrant lizards)

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Did You Know?

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Brachiosaurus was about 2.1x longer than Tyrannosaurus Rex.

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Brachiosaurus weighed roughly 7x more than Tyrannosaurus Rex.

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Brachiosaurus was a herbivore while Tyrannosaurus Rex was a carnivore.

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Brachiosaurus lived during the Jurassic Late while Tyrannosaurus Rex lived during the Cretaceous Late, separated by roughly 44 million years.

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Brachiosaurus was discovered 2 years earlier, in 1903.

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Brachiosaurus belonged to Sauropoda while Tyrannosaurus Rex belonged to Tyrannosauridae.

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Compare With Other Dinosaurs

Brachiosaurus vs Diplodocus

Herbivore vs Herbivore

Stegosaurus vs Brachiosaurus

Herbivore vs Herbivore

Tyrannosaurus Rex vs Allosaurus

Carnivore vs Carnivore

Tyrannosaurus Rex vs Carcharodontosaurus

Carnivore vs Carnivore

Tyrannosaurus Rex vs Giganotosaurus

Carnivore vs Carnivore

Tyrannosaurus Rex vs Spinosaurus

Carnivore vs Piscivore
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Explore These Dinosaurs

Brachiosaurus

Brachiosaurus altithorax

26.0m long, 13.0m tall, 56.0t · Jurassic Late

Tyrannosaurus Rex

Tyrannosaurus rex

12.3m long, 3.7m tall, 8.4t · Cretaceous Late

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