Thanks to a combination of sensing the Earth's magnetic field through vision and an in-built compass that allows them to orient themselves according to magnetic intensity, migratory birds don't have much trouble finding their way.
suggested similar ideas as a means for birds to return to their desired flight paths if an extreme weather event had sent them off course.
If these birds actually use cues from Earth's magnetic field to locate their original breeding site, then the researchers reason that yearly variations in Earth's magnetic field should be reflected in gradual positional changes of the bird's nesting areas.
The authors suggest that the birds 'learn' the inclination angle before departing their breeding sites.
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