The first ever evidence of a dinosaur which swam, lived and hunted underwater has been discovered in the now-barren wilderness of the Saharan desert. But 100 million years ago this region would have been a lush oasis interspersed with rivers and waterways teeming with life. And lurking beneath the surface, sitting atop the entire food chain, was a fearsome aquatic dinosaur. The river monster — called Spinosaurus aegyptiacus — powered ...