Laying a pale final egg in a clutch might warn off potential freeloaders.
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References
Ruxton,G. D.,Broom, M. & Colegrave, N. Are unusually colored eggs a signal to potential conspecific brood parasites? American Naturalist 157,451- 458 2001.
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Whitfield, J. A lighter shade of egg. Nature (2001). https://doi.org/10.1038/news010404-19
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DOI: https://doi.org/10.1038/news010404-19