Underwater Vision of the Sea Otter

@article{Gentry1967UnderwaterVO,
  title={Underwater Vision of the Sea Otter},
  author={R L Gentry and R. S. Peterson},
  journal={Nature},
  year={1967},
  volume={216},
  pages={435-436}
}
A sea otter, Enhydra lutris, was trained to select the larger of two disks simultaneously presented under water, and its ability to discriminate between disks of nearly the same size was tested. The results provide an index of visual acuity, and suggest that Enhydra has slightly poorer underwater vision than Zalophus or Phoca. 

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