Subaqueous foraging among carnivorous dinosaurs - Nature.com

In extinct species including non-avian dinosaurs, bone density is shown to be a reliable indicator of aquatic behavioural adaptations, which emerged in spinosaurids during the Early Cretaceous.

Kelley, N. P. & Pyenson, N. D. Evolutionary innovation and ecology in marine tetrapods from the Triassic to the Anthropocene. Science348, aaa3716 (2015). PubMed  Google Scholar 

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