Dental arrays may be optimized for sound in shallow waters.
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References
Dobbins P. Bioinsp. Biomim., 2. 19 - 29 (2007).
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Ledford, H. Better sonar through dolphin teeth. Nature (2007). https://doi.org/10.1038/news070319-2
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DOI: https://doi.org/10.1038/news070319-2