Photo of the dinosaur at Sinclair gas station at 4355 South Broadway, St Louis, MO. Courtesy of Toby Weiss, who blogs in St. Louis at www.beltstl.com Toby Weiss ...

A "masked" dinosaur that lived 130 million years ago was a master at disguise who could hide even in broad daylight from its predators, relatives of the fearsome Tyrannosaurus rex, a new study finds.