2 Fast and Frugal Modification (IMAGE) University of Maryland Caption Among small theropods, long hind limbs gave the advantage of speed, but among the giants, long hind limbs enabled more efficient locomotion. Credit Courtesy T. Holtz, University of Maryland Usage Restrictions Please Credit T. Holtz, University of Maryland License Licensed 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.