The most complete skeleton of a type of pot-bellied dinosaur, a therizinosaur, has been discovered in southern Utah. Such remains shed light on the evolution of leafy and meaty diets back in paleo times, suggesting that iconic predators like Velociraptor may have evolved from less fearsome plant-eating ancestors. The newly discovered dinosaur, dubbed Nothronychus graffami, lived some 93 million years ago. When alive, the animal would have stood at 13 feet (4 meters) and sported a beaked mouth and forelimbs tipped with 9 inch- (22 cm)-long sickle claws. Its stumpy legs, large gut and other features suggest the lumbering giant...