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This study was supported by the Deutsche Forschungsgemeinschaft in the program SFB 45 and a scholarship by the Konrad-Adenauer-Stiftung to A. Helbig. We wish to thank P. Berthold for his help in obtaining the test birds, and D. Burckhard and R. Schwind for their help in determining the optical properties of the filters used.
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Helbig, A.J., Wiltschko, W. The skylight polarization patterns at dusk affect the orientation behavior of blackcaps,Sylvia atricapilla . Naturwissenschaften 76, 227–229 (1989). https://doi.org/10.1007/BF00627697
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DOI: https://doi.org/10.1007/BF00627697