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No, some other dinosaurs also had sails. One was Irritator, a relative of Spinosaurus, which had a similar, but smaller, sail. Another was Hypacrosaurus, which was a quadrupedal herbivore that had very high spines on its back. One animal commonly referred to as a dinosaur, Dimetrodon, was not a dinosaur, but it was a prehistoric reptile with a sail on its back.

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9y ago
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8y ago

No. There were a few others, some related to the Spinosaurus itself (Oxalaia), and others unrelated, but still possessing the sail, such as Ouranosaurus.

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Q: Was Spinosaurus the only sailback dinosaur?
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