Some male fish masquerade as females in order to fertilize eggs in other males' nests. Their disguise is so thorough that these cuckolding males even react like females to a chemical brain messenger.
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References
Goodson,J.L. & Bass, A.H. Forebrain peptides modulate sexually polymorphic vocal circuitry. Nature 403, 769 2000.
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Cross, S. Sex and sneakers. Nature (2000). https://doi.org/10.1038/news000217-9
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DOI: https://doi.org/10.1038/news000217-9
