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Penguins are infamous for being ready for any formal event, yet it seems that we’re still unsure why they, and numerous animals have this distinct color contrast.
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Sources:
https://www.jstor.org/stable/4068693?seq=1#metadata_info_tab_contents
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2674085/
https://www.researchgate.net/profile/Jon_Blount/publication/40701561_The_adaptive_significance_of_dark_plumage_for_birds_in_desert_environments/links/0c960535582cac836e000000.pdf
http://academic.brooklyn.cuny.edu/biology/jbasil/documents/COUNTERSHADINGCLASS10.pdf
https://ufdc.ufl.edu/AA00062319/00001/73x
https://www.ncbi.nlm.nih.gov/pubmed/21227055
https://www.sciencedirect.com/science/article/pii/S0003347207002813
https://academic.oup.com/beheco/article/16/2/327/297795
https://academic.oup.com/beheco/article/14/6/823/269154
https://royalsocietypublishing.org/doi/full/10.1098/rsos.170801
https://www.researchgate.net/publication/232694725_The_Adaptive_Significance_of_Coloration_in_Mammals
https://www.sciencedirect.com/science/article/pii/S030645651930292X
https://arc.aiaa.org/doi/abs/10.2514/6.2018-3901
