Sperm whales' big heads may be weapons.
References
Carrier, D. R., Deban, S. M. & Otterstrom, J. The face that sank the Essex: potential function of the spermaceti organ in aggression. Journal of Experimental Biology 205, 1755 - 1763 (2002).
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Whitfield, J. Moby Dick had head start. Nature (2002). https://doi.org/10.1038/news020603-7
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DOI: https://doi.org/10.1038/news020603-7
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