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Speculation about a sail

The fish-eating dinosaur Spinosaurusmight have been an avid swimmer. As Susan Milius reported in “Lost-and-found dinosaur led a semiaquatic life” (SN: 10/18/14, p. 10), adaptations like dense limb bones and small hips hint that the big predator thrived in water.

The findings inspired a lot of discussion about Spinosaurus’ tall, saillike flap that rose from its back.