![]() The best known example is the gorget (throat feathers) of many hummingbird species. Instead of pigments, these colors are produced as light is refracted by the proteins in the feather. ![]() Bird species that commonly show aberrant white patches include Canada Goose, American Crow, Black-capped Chickadee, Dark-eyed Junco, Common Grackle, and House Sparrow.Īdding to the diversity of avian colors are colors produced by the structure of the feather. Color abnormalities, while not common, do occur on a regular basis. When pigments are present (or absent) at unusual levels the appearance of a bird can change dramatically. ![]() Two American Crows, the bird on the right has lower than normal levels of melanin pigments: Image: Kevin J.
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