Chinese and British paleontologists have discovered what could be the fossil remains of the largest winged dinosaur. The remains were found in northeast China and measured 5.5 feet (1.6 m) long. Researchers believed this dinosaur weighed more than 40 pounds (18.1 kg) and could not fly. So what did the dinosaur use its wings for? Many believe the wings were used to attract mates or keep eggs in a nest warm.