Preserved Bones of Kryptodrakon progenitor (image) George Washington University Caption The preserved bones of Kryptodrakon progenitor (shown here in different views) has yielded new discoveries on the origin of the pterodactyloids, a group of flying reptiles that would go on to become the largest known flying creatures to have ever existed. Scale bar is 50 mm. Credit Illustration by Brian Andres Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.