Quetzalcoatlus launch (IMAGE) University of Texas at Austin Caption A step-by-step reconstruction of a proposed Quetzalcoatlus launch sequence. The pterosaur crouches, leaps and then starts to flap its wings. Credit Credit: Kevin Padian et al / John Conway Usage Restrictions Include credit License Original content 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.