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Heidrich, Lea; Friess, Nicolas; Fiedler, Konrad; Brändle, Martin; Hausmann, Axel; Brandl, Roland; Zeuss, Dirk (2018). "The dark side of Lepidoptera: Colour lightness of geometrid moths decreases with increasing latitude". Global Ecology and Biogeography. 27 (4): 407–416. Bibcode:2018GloEB..27..407H. doi:10.1111/geb.12703.
Saranathan, Vinodkumar; Burtt, Edward H. (2007). "Sunlight on Feathers Inhibits Feather-Degrading Bacteria". The Wilson Journal of Ornithology. 119 (2): 239–245. doi:10.1676/05-123.1. S2CID84253238.