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Spectral reflectance and directional properties of structural coloration in bird plumage

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Fig. 2. Reflectance geometry. (A) Directionality. A directionally iridescent feather can beunderstood as an imperfect spectrally tuned mirror
Fig. 3. Photographs of feathers indicating how colours alter with varying surfaceO=45 °, E=5 °; (iii) O=45 °, O=0°, E=5°; (ii) =5°, OEkingfisher
Fig. 4. Reflectance spectra of the magnificenthummingbird crown. This had directionalOthan under a point source, and reflectance wasgreatest when the feather was viewedobliquely
Fig. 5. Reflectance spectra of the feral pigeon nape. This had directional coloration, with multiplypeaked reflectance
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