Bright blue eggs keep males keen on fatherhood.
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References
Morales, J., Velando, A. & Moreno, J. Behav. Ecol. Sociobiol. doi:10.1007/s00265-008-0653-x (2008).
Moreno, J., Osorno, J.L., Morales, J., Merino, S., and Tomás, G. J. Avian Biol. 35, 300–304 (2004)
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Kaplan, M. Female birds sacrifice health to create more colourful eggs. Nature (2008). https://doi.org/10.1038/news.2008.1146
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DOI: https://doi.org/10.1038/news.2008.1146