Male Northern Cardinals, Scarlet Tanagers, and House Finches all have striking red plumage that’s thought to play a role in attracting mates. Males with the brightest red feathering tend to have the best luck with the females. Scientists think that a male’s redness signals to females that he has just what it takes to help produce superior offspring. But just because a male is a brilliant shade of red... does that mean he’s stronger or more fit than his duller-colored competitors? It might be so, but it’s complicated…

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