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Nature 581 (2020): the description of Spinosaurus's paddle-like tail, the principal evidence for a semiaquatic, river-hunting giant theropod. Its aquatic interpretation remains debated within paleontology.
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Tail-propelled aquatic locomotion in a theropod dinosaur
Nizar Ibrahim, Simone Maganuco, Cristiano Dal Sasso, et al. · 2020