Abstract
Sexual mimicry among animals is widespread1,2, but does it impart a fertilization advantage in the widely accepted ‘sneak–guard’ model3 of sperm competition? Here we describe field results in which a dramatic facultative switch in sexual phenotype by sneaker-male cuttlefish leads to immediate fertilization success, even in the presence of the consort male. These results are surprising, given the high rate at which females reject copulation attempts by males, the strong mate-guarding behaviour of consort males, and the high level of sperm competition in this complex mating system4,5.
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Supplementary movie (download MOV )
This movie shows a successful extrapair copulation by a small male cuttlefish in the presence of a large consort male that is fighting off another large rival male. The female mimic is in the bottom of the scene as it opens. Another mimic appears about halfway through the short movie. (MOV 1051 kb)
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Hanlon, R., Naud, MJ., Shaw, P. et al. Transient sexual mimicry leads to fertilization. Nature 433, 212 (2005). https://doi.org/10.1038/433212a
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DOI: https://doi.org/10.1038/433212a


