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Earth Matters : Cracking the mystery of how birds’ eggs are blue

By Katie Koerten

Last November I wrote an article for this column about the color blue in nature: how rare it is, and how difficult it is for nature to even produce it. To my delight, it garnered a lot of interest and curiosity, and even a letter to the editor with a story about why robins’ eggs are blue. I thought this a dazzling — and timely! — example of blue in nature to write about in springtime.