When it comes to spectacular displays of color, birds are obvious standouts in the natural world. Many brightly colored birds get their pigments from the foods that they eat, but that's not true of parrots. Now, researchers reporting a study of familiar pet store parakeets—also known as budgies—have new evidence to explain how the birds produce their characteristic yellow, blue, and green feathers.
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How yellow and blue make green in parrots
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