Thomas Holtz Measuring Toe (IMAGE) University of Maryland Caption Thomas Holtz, principal lecturer in the UMD Department of Geology, measures a dinosaur toe bone. Holtz and his colleagues found that long lower limbs were an adaptation that made large theropod dinosaurs more efficient at walking, helping them conserve energy as they hunted. Credit Photo courtesy of Thomas Holtz Usage Restrictions None 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.