Multiple experiments, performed by three independent research groups, have demonstrated disruption of the magnetic orientation of birds by oscillating magnetic fields (OMFs) in the megahertz frequency range [[10–14](javascript:;)]. The reality of this phenomenon is beyond reasonable doubt. To date, there are two alternative explanations of this effect. One hypothesis assumes that OMFs directly affect the compass magnetoreceptor based on radical pair reactions in cryptochrome by destroying the spin correlation between electrons that form the radical pair. The sensitivity to radiofrequency OMFs was therefore suggested as a key distinctive feature of the radical-pair mechanism of magnetoreception [[9](javascript:;),[10](javascript:;)]. The second hypothesis suggests the detection of OMFs by a separate sensory system, by a signal from which the central nervous system blocks the magnetic compass—for example, to avoid orientation errors under the conditions of a perturbed geomagnetic field as a result of solar activity or atmospheric electromagnetism (thunderstorms) [[15](javascript:;),[16](javascript:;)].
