Insights into the adaptive significance of vertical pupil shape in snakes

@article{Brischoux2010InsightsIT,
  title={Insights into the adaptive significance of vertical pupil shape in snakes},
  author={F. Brischoux and L. Pizzatto and R. Shine},
  journal={Journal of Evolutionary Biology},
  year={2010},
  volume={23}
}
Pupil shape in vertebrates ranges from circular to vertical, with multiple phylogenetic shifts in this trait. Our analyses challenge the widely held view that the vertical pupil evolved as an adaptation to enhance night vision. On functional grounds, a variable‐aperture vertical pupil (i) allows a nocturnal species to have a sensitive retina for night vision but avoid dazzle by day by adjusting pupil closure, and (ii) increases visual acuity by day, because a narrow vertical pupil can project a… Expand
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