Fast-moving Snails (IMAGE) University of Chicago Press Journals Caption In a peaceful tropical stream in Martinica, the ecologist's boot meets with a crawling army of invading snails Tarebia granifera. Credit Courtesy Facon and David. 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.