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" ... The magnetic sense of animals is best studied in birds. Cells found in the Nervus ophthalmicus, part of the bird's eye nervous system, seem to react to changes in the magnetic field, helping birds to detect the direction and inclination of magnetic fields. The specialized cells contain tiny magnetic crystals, embedded in oil droplets. The crystals can freely move in accordance with changes of the magnetic field lines. The cells react to the movement of the crystals, but also to changes in the transmission of light, caused by the alignment of the crystals. Some fish species, like the common trout, possess specialized cells with magnetic crystals in the tissue of the nasal cavity. In 1994 a magnetic sense was discovered also in marine turtles. ... "