A Nymphal Blacklegged Tick on Leaf Litter (IMAGE) U.S. National Science Foundation Caption This image shows a nymphal blacklegged tick on leaf litter in Tennessee. Credit Graham Hickling 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.