Aspects of this topic are discussed in the following places at Britannica.
...true celestial navigation is involved because the birds determine their latitude and longitude by the position of the stars. In a planetarium in Germany, blackcaps (Sylvia atricapilla) and garden warblers (S. borin), under an artificial autumn sky, headed “southwest,” their normal direction; lesser whitethroats (S. curruca) headed “southeast,”...
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