Sunday, August 5, 2012

House Finch

Although most male House Finches are brick red, pale yellow and bright orange ones occasionally appear at local feeders. This yellow variant was at the The Flower Fields of Carlsbad, California, when Erika and I visited last March. Yellow color is the result of beta-carotene, while red is produced by echinenone. More yellow birds are noted in areas where natural foods are low in echinenone or when ornamental plants have high levels of beta-carotene (Project Feeder Watch).

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