Sperm of Bluethroat (IMAGE) Natural History Museum, University of Oslo Caption The helical sperm of the bluethroat (Luscinia svecica). Credit Hanna Støstad 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.