We quantitatively test four components of this hypothesis on variably colored eggs of the village weaverbird Ploceus cucullatus in a controlled light environment. Researchers show that egg color protects the embryo from harmful sunlight ScienceDaily.
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Why do robins lay blue eggs. Why robin eggs are blue. 1 damaging ultraviolet radiation can transmit through bird eggshells 2 infrared radiation at natural intensities can heat the interior of eggs 3 more intense egg coloration decreases light transmittance pigment as parasol and 4 more intense egg coloration increases absorbance of light by the eggshell.
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