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Abstract
Sandhoppers are reported to rely on the length of the light phase to calculate a mean variation of azimuth speed. We conducted some experiments to test the influence of the length of the light phase on the computation of the azimuthal speed variation of the sun during the day by homing pigeons. We performed releases with birds which had been subjected to a reduction of the light phase. The results indicated that shortening the light phase does not affect the orientation performance of the homing pigeons, showing that the azimuth speed compensation mechanism in these birds is independent of the duration of the light phase.