Fossilized feathers reveal colourful past.
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References
Clarke, J. A., et al. Science doi:10.1126/science.1193604 (2010).
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Laursen, L. Emperor penguin's old clothes are unveiled. Nature (2010). https://doi.org/10.1038/news.2010.506
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DOI: https://doi.org/10.1038/news.2010.506