Otter (IMAGE) Helmholtz Centre for Environmental Research - UFZ Caption Eurasian otters (Lutra lutra. L.) are only rarely seen in daylight. One reason why our knowledge about the threatened species is still very limited. Credit Photo: André Künzelmann/ UFZ 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.