Giant Spinosaurus Likely Was First Semiaquatic Dinosaur; Bigger Than Tyrannosaurus Rex

Fossils discovered in the Moroccan Sahara and a partial skull and other remains that have been in museum collections for as long as a century have led researchers to conclude the Spinosaurus was the first truly semiaquatic dinosaur. The Cretaceous-era predator was 9 feet longer than the largest Tyrannosaurus rex specimen.