...to understand whether the mechanisms and principles of magnetoreception are similar across taxa. In this project, we will focus on migratory bats. By measuring orientation decisions following magnetic treatments in either a field laboratory or under free-flight conditions in radio-tagged bats by utilising a network of digital telemetry stations, we are now able to test the two prevailing hypotheses, the radical-pair-based and the magnetic-particle-based magnetoreception mechanism, in a mammalian model.