Birds utilize two different sources of navigation during migration. They have been documented using the sun, or following Earth’s magnetic fields. In addition to these techniques, certain factors such as visual and olfactory cues help guide birds to traditional nesting places during the winter. Also not to be discounted is the flock organization which may serve as an initiation during their first migration after reaching adulthood. There is some speculation about a genetic component involved. All in all, it seems as if birds do have a variety of tools available for them to identify where to go when migration occurs, and it is likely that it is a combination of these which guides them to their destinations.
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