Geomagnetic field is produced by the earth and gravity. The pressure caused by this magnetic field can also help birds to orient. For many years, ornithologists have conducted numerous experiments to see what is the relationship between birds and magnetic field is. Then they have found evidence that in some cases, if the pigeon carried a magnet with them, they cannot orient themselves as they would without a magnetic. From all experiments, it is now known that birds will use this magnetic compass in addition to the sun and stars to navigate itself.
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