Cattle egrets are less able to cope with light refraction than are other herons

@article{Katzir1999CattleEA,
  title={Cattle egrets are less able to cope with light refraction than are other herons},
  author={Gadi Katzir and Tamir Strod and Edna Schechtman and Shlomo Hareli and Zeev Arad},
  journal={Animal Behaviour},
  year={1999},
  volume={57},
  pages={687-694}
}
The majority of heron species (Aves, Ardeidae) forage on aquatic prey in shallow water. Prey detection, aiming and the beginning of the capture strikes are performed while the heron's eyes are above water. For most angles, as a result of air/water light refraction, the apparent image available to a heron is vertically displaced from the prey's real position. Herons must therefore correct for refraction. We tested the hypothesis that species that forage in aquatic habitats should be more able to… 

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