Drill Holes in Shells Point to Big Predators Picking off Small Prey (image) Florida Museum of Natural History Share Print E-Mail Caption The hole in this Glycymeris americana, or American bittersweet, testifies to the mollusk's grisly end as a meal for a drilling predator. Drill holes provide a record of increasingly bigger predators feeding on small prey. Credit Florida Museum of Natural History photo by Kristen Grace Usage Restrictions Please provide photo credit. Share Print E-Mail 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.