The largest predatory dinosaur to walk this earth wasn’t the T. rex. It was Spinosaurus aegyptiacus, a 50-foot long creature with powerful jaws and a solid, spiny sail on its back that dwelled in Northern Africa 95 million years ago. This is the first water-adapted non-avian dinosaur on record, said University of Chicago paleontologist Paul Sereno in a press conference yesterday. Sereno is part of a team of researchers that was finally able to reconstruct Spinosaurus in full using newly discovered fossils and information gathered from the dinosaur’s initial discoverer, a German paleontologist named Ernst Stromer.