Tetrachromacy, oil droplets and bird plumage colours

@article{Vorobyev1998TetrachromacyOD,
  title={Tetrachromacy, oil droplets and bird plumage colours},
  author={Misha Vorobyev and Daniel C. Osorio and Andrew T. D. Bennett and N. Justin Marshall and Innes C. Cuthill},
  journal={Journal of Comparative Physiology A},
  year={1998},
  volume={183},
  pages={621-633}
}
Abstract There is a growing body of data on avian eyes, including measurements of visual pigment and oil droplet spectral absorption, and of receptor densities and their distributions across the retina. [...] Key Method Discriminability is enhanced both by tetrachromacy and coloured oil droplets. Oil droplets may also improve colour constancy. Comparison of the performance of a pigeon's eye, where the shortest wavelength receptor peak is at 410 nm, with that of the passerine Leiothrix, where the ultraviolet…Expand
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