Both lived in the Late Jurassic Morrison Formation of North America and were true contemporaries.
Brachiosaurus (26 m, ~56,000 kg) was enormous compared to Stegosaurus (9 m, ~5,000 kg).
Stegosaurus was a low-browsing herbivore; Brachiosaurus reached vegetation over 9 meters high.
Stegosaurus used its thagomizer tail for active defense; Brachiosaurus likely relied on its size for protection.
Stegosaurus had one of the smallest brains relative to body size of any dinosaur; Brachiosaurus had a proportionally small brain as well.
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Did You Know? fun facts
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Did You Know?
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Brachiosaurus was about 2.9x longer than Stegosaurus.
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Brachiosaurus weighed roughly 11x more than Stegosaurus.
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Both Brachiosaurus and Stegosaurus were herbivores.
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Both dinosaurs lived during the Jurassic Late period and may have coexisted.
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Stegosaurus was discovered 26 years earlier, in 1877.
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Brachiosaurus belonged to Sauropoda while Stegosaurus belonged to Stegosauria.
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