Common Murres (IMAGE) University of California - Santa Cruz Caption Common murres in Monterey Bay. Researchers assessing the prevalence and composition of microplastics in Monterey Bay found microparticles (particles smaller than 5 millimeters) in the digestive tracts of all the common murres they examined, and in 58% of the anchovies, which make up a large part of the murres' diets. Credit Laird Henkel Usage Restrictions For use only with news coverage of this research 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.