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Why are there redheads? Birds might hold the clues


PhysOrg

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Biologists examined the survival rates and chestnut feather coloration of barn swallows and other species of birds, to unearth factors favoring the evolution of pheomelanin in spite of its costs. They found that under conditions of low stress, birds with larger amounts of pheomelanin survived better, suggesting the pigment may serve a beneficial role.O3RD1GRHQyY

 

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