Birds are sensitive to Earth's magnetic field

While scientists have believed for a long time that birds can sense the Earth's magnetic field in their migratory flights, no one has been able to explain how it works. Recent research has suggested how the mechanism might work. Birds have magnetic sensors in their eyes, and the direction of magnetic field may be perceived as a dark or light spot against the field of view of the bird. Another organ the birds use is magnetic particles in their beaks.