Pterosaur 1 (IMAGE) University of Leicester Caption Growth stages of Pterodactylus. From tiny ‘flaplings’ no larger than a sparrow, most known specimens represent ‘teenagers’ comparable in size to a pigeon. Fully grown individuals boasted impressive wingspans exceeding 1 metre. Unlike birds, which must grow before achieving flight, even the smallest Pterodactylus were capable of flight from an early age. Credit University of Leicester Usage Restrictions Use only with 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.