Bird Migration Altitudes Bird Migration Altitudes

The most significant influence on the altitude at which birds fly is the weather, especially cloud cover and wind fields. Birds may fly lower when it is cloudy or, if the overcast is not too thick, they may ascend through it to reach the clear skies above. If favorable tail winds are to be found in certain altitudinal strata, birds often ascend or descend in order to take advantage of them.

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