Polarization in a Male Northern Swordtail (IMAGE) Washington University in St. Louis Caption A video polarimetry image of a large male northern swordtail in false color shows the differences in polarization on its surface. Credit V. Gruev 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.