Earthworms (1 of 3) (IMAGE) Imperial College London Caption Earthworms in a pile of leaf litter. They drag fallen leaves and other plant material down from the surface and eat them, enriching the soil. Credit Dr. Manuel Liebeke, Imperial College London 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.