Evidence that seals may use echolocation


Harbour seals (Phoca vitulina ), like many phocid species, forage to some extent at night1. Although nocturnal mammals typically rely on non-visual sensory channels, seals have adapted to low light levels by sharpening their visual sense2. Although enhanced visual sensitivity would be functional in clear water, many species inhabit turbid coastal or estuarine regions where vision is sometimes of limited use even in daylight. Here we present experimental evidence in support of the contention that when visual cues are not available, seals use echolocation. Our results help to explain why previous attempts to demonstrate sonar abilities in pinnipeds have been unsuccessful.

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Renouf, D., Davis, M. Evidence that seals may use echolocation. Nature 300, 635–637 (1982). https://doi.org/10.1038/300635a0

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