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How did cardinals get those bright red feathers? – Washington University School of Medicine in St. Louis
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Why Are Cardinals Red? – ~ When Life is Good ~
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She a bird no1: Sexually dimorphic Northern Cardinals: Why male and female cardinals are a different color
Northern Cardinal Identification, All About Birds, Cornell Lab of Ornithology
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Alabama's yellow cardinal: The science behind an amazing, rare bird - al.com
What Color Are Female Cardinals? Secrets of Female Cardinal Birds
