BIRD 1 (IMAGE) Rice University Caption Urban crows, ducks and gulls are a potentially important reservoir of antimicrobial resistance genes, according to Rice University engineers who studied their droppings. Credit Rice University 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.