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The pink flush apparent on the breast of this Franklin's gull is produced by astaxanthin, a carotenoid pigment acquired by the bird's diet. Keith Corliss

Some colors dependent on food source

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You are what you eat. Or at least that's what we've heard all our lives. Of course it's not meant in a literal sense. I don't consider myself a pizza although I indulge in the vegetable, meat, and cheese pies with some regularity.

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