Multiscale description of avian migration: from chemical compass to behaviour modeling
Despite decades of research the puzzle of the magnetic sense of migratory songbirds has still not beenunveiled. Although the problem really needs a multiscale description, most of the individual researchefforts were focused on single scale investigations. Here we seek to establish a multiscale link betweensome of the scales involved, and in particular construct a bridge between electron spin dynamics andmigratory bird behaviour. In order to do that, we first consider a model cyclic reaction scheme thatcould form the basis of the avian magnetic compass. This reaction features a fast spin-dependentprocess which leads to an unusually precise compass. We then propose how the reaction could be realized in a realistic molecular environment, and argue that it is consistent with the known facts about avian magnetoreception. Finally we show how the microscopic dynamics of spins could possibly be interpreted by a migrating bird and used for the navigational purpose.