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A predatory dinosaur that was bigger than Tyrannosaurus rex may have been able to use its tail to swim through water, allowing it to hunt aquatic prey.
“It opens up an entire new world of ecological possibilities for dinosaurs,” says Nizar Ibrahim at the University of Detroit Mercy.
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Ibrahim and his colleagues analysed a 95 million-year-old fossilised tail of Spinosaurus aegyptiacus, which they first unearthed in the Kem Kem beds in south-eastern Morocco in 2018.
They discovered that the dinosaur’s tail had an unusual paddle-like shape, with long spines near the tip, and was …