Against a backdrop of looming skyscrapers, a robot dinosaur raises its feathery wings, sending its prey fleeing in terror. It is a scientific invention to show how some dinosaurs could have flapped primitive wings to scare their quarry out of hiding, similar to birds like the roadrunner. In this case, the robo-dino's prey is a grasshopper, which responds by springing into a shrub. The interaction was shown in a video released alongside a study by researchers in Seoul, South Korea. The findings were published in the journal Nature and reported by AFP.