Apatosaurus (22 m, ~22,700 kg) was shorter but significantly heavier than Diplodocus (25 m, ~14,000 kg).
Both lived in the Late Jurassic Morrison Formation and were likely contemporaries.
Apatosaurus had a more robust, barrel-like body; Diplodocus had a more slender, elongated build.
Apatosaurus was formerly (and incorrectly) synonymized with Brontosaurus โ Brontosaurus is now considered a separate valid genus.
Both had long, whip-like tails that may have been used for defense or acoustic signaling.
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Did You Know? fun facts
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Did You Know?
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Both Apatosaurus and Diplodocus were herbivores.
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Both dinosaurs lived during the Jurassic Late period and may have coexisted.
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Apatosaurus was discovered 1 years earlier, in 1877.
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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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