Tetrachromacy, oil droplets and bird plumage colours

  title={Tetrachromacy, oil droplets and bird plumage colours},
  author={Misha Vorobyev and D. Osorio and A. T. D. Bennett and N. Justin Marshall and Innes C. Cuthill},
  journal={Journal of Comparative Physiology A},
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. These data are sufficient to predict psychophysical colour discrimination thresholds for light-adapted eyes, and hence provide a basis for relating eye design to visual needs. We examine the advantages of coloured oil droplets, UV vision and tetrachromacy for discriminating a diverse set of avian plumage… CONTINUE READING
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