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  1. Spatial summation improves bird color vision in low light intensities
  2. Losing focus: how lens position and viewing angle affect the function of multifocal lenses in fishes
  3. Complementary shifts in photoreceptor spectral tuning unlock the full adaptive potential of ultraviolet vision in birds
  4. Quantitative studies of animal colour constancy: using the chicken as model
  5. A shape-anisotropic reflective polarizer in a stomatopod crustacean
  6. Optics of cone photoreceptors in the chicken ( Gallus gallus domesticus )