Evolution and spectral tuning of visual pigments in birds and mammals

@article{Hunt2009EvolutionAS,
  title={Evolution and spectral tuning of visual pigments in birds and mammals},
  author={David M. Hunt and Livia S. Carvalho and Jill A. Cowing and Wayne I L Davies},
  journal={Philosophical Transactions of the Royal Society B: Biological Sciences},
  year={2009},
  volume={364},
  pages={2941 - 2955}
}
Variation in the types and spectral characteristics of visual pigments is a common mechanism for the adaptation of the vertebrate visual system to prevailing light conditions. The extent of this diversity in mammals and birds is discussed in detail in this review, alongside an in-depth consideration of the molecular changes involved. In mammals, a nocturnal stage in early evolution is thought to underlie the reduction in the number of classes of cone visual pigment genes from four to only two… 

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