Abstract
A reivew of the studies on the migratory orientation of Garden Warblers, Sylvia borin, indicates that the relative importance of stars and the magnetic field varies in the course of time: During actual migration, the magnetic field appears to be the predominant cue, whereas during ontogeny celestial information also seems to play an important role. Although migratory orientation by the magnetic compass can develop without celestial cues, there is normally a complex interaction between both systems which we do not understand yet. The possibility that the magnetic field and celestial rotation both serve as references for the innate migratory direction is discussed.
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