Brachiosaurus (26 m, ~56,000 kg) was much heavier than Diplodocus (25 m, ~14,000 kg) despite similar length.
Brachiosaurus had longer front legs than hind legs, giving it a giraffe-like upward posture for high browsing; Diplodocus held its neck roughly horizontal.
Diplodocus had a proportionally much longer tail that it may have used as a whip; Brachiosaurus had a shorter, stouter tail.
Both lived in the Late Jurassic Morrison Formation of North America and were likely contemporaries.
Brachiosaurus had spatula-shaped teeth; Diplodocus had pencil-shaped peg teeth โ both adapted for stripping vegetation.
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Did You Know? fun facts
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Did You Know?
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Brachiosaurus weighed roughly 4x more than Diplodocus.
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Both Brachiosaurus and Diplodocus were herbivores.
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Both dinosaurs lived during the Jurassic Late period and may have coexisted.
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Diplodocus was discovered 25 years earlier, in 1878.
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Both belong to the Sauropoda clade, making them relatively close relatives.
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Related comparisons
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