Bizarre Spinosaurus makes history as first known swimming dinosaur

A newfound fossil tail from this giant predator stretches our understanding of how—and where—dinosaurs lived.

Two Spinosaurus aegyptiacus hunt Onchopristis, a prehistoric sawfish, in the waters of a vast river system that once covered Morocco more than 95 million years ago. Newfound fossils demonstrate that the dinosaur's tail was well suited for swimming—bolstering the case that Spinosaurus spent much of its time in the water.

JASON TREAT, NG STAFF; MESA SCHUMACHER. ART: DAVIDE BONADONNA
NIZAR IBRAHIM, UNIVERSITY OF DETROIT MERCY

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