A taste for red leaves may have given us full colour vision.
References
Dominy,N. J.& Lucas, P. W. The ecological importance of trichromatic colour vision in primates. Nature 410,363- 366 2001.
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Clarke, T. Hungry primates see red. Nature (2001). https://doi.org/10.1038/news010315-11
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DOI: https://doi.org/10.1038/news010315-11
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