Underwater echolocation has built-in dimmer switch.
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References
Au, W. W. L. & Benoit-Bird, K. J. Automatic gain control in the echolocation system of dolphins. Nature, 423, 861 - 863, (2003).
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Hopkin, M. Dolphins hush clicks to pinpoint prey. Nature (2003). https://doi.org/10.1038/news030616-10
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DOI: https://doi.org/10.1038/news030616-10