How do caterpillars acquire chubby legs (IMAGE) National University of Singapore Caption Photograph of an Attacus atlas caterpillar depicting the differences between the thoracic legs, which are uniramous (have one branch) and end in a single claw, and the prolegs, which are fleshy and have many crochets at the tip. Credit A. Monteiro Usage Restrictions NA 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.