Abstract
SOME investigators have suggested that seals and sea lions rely primarily on sight when catching food under water1–4. Earlier experiments on the visual acuity of pinnipeds under water2 were largely unsuccessful in keeping animals at a minimum distance from the stimuli so that accurate visual angles could be calculated, and in using stimulus configurations in which visual resolving power could be measured uncontaminated by intensity discriminations5. This report describes experiments which have corrected these deficiences.
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References
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SCHUSTERMAN, R., BALLIET, R. Visual Acuity of the Harbour Seal and the Steller Sea Lion under Water. Nature 226, 563–564 (1970). https://doi.org/10.1038/226563a0
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DOI: https://doi.org/10.1038/226563a0
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