Endangered vulture eats excrement to attract mates.
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References
Negro, J. J. et al. An unusual source of essential carotenoids. Nature 416, 807 - 808 (2002).
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Louis, M. Faeces brings colour to birds' faces. Nature (2002). https://doi.org/10.1038/news020422-14
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DOI: https://doi.org/10.1038/news020422-14