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Earth’s north magnetic pole is moving from Canada towards Siberia. Has there been a noticeable effect on migrating animals that sense the geomagnetic field as a navigation aid?
Mark Thompson
Tewkesbury, Gloucestershire, UK
For any animal that is using a magnetic field for long migrations, they may be using it only to detect deviations from their planned route. It has been proposed that migratory birds, for example, have at least three different compasses at their disposal: one allows them to extract information from the position of the sun in the sky, another uses the patterns of the stars at…
