Warblers and Virtual Magnetic Displacements (image) Cell Press Share Print E-Mail Caption This graphical abstract depicts how using virtual magnetic displacements, Chernetsov et al. suggest that experienced Eurasian reed warblers can use magnetic declination to detect longitude. Credit Ekaterina Chernetsova Usage Restrictions Credit Required. Share Print E-Mail 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.