With many of us dying Easter eggs this week, I got curious about eggs that are naturally colored. We’ve raised chickens (Ameraucanas) that laid turquoise-to-olive eggs; our current flock of Black Sex-links lay in shades of tan. In fact, I usually have to buy white eggs at the store in order to achieve those pastel Easter hues.
But what about other kinds of birds? For instance, why do American Robins lay blue eggs, Burrowing Owls lay white eggs, while the American Golden Plover lays eggs that look like ovoid granite rocks, with big, black speckles on a white background? How and why do eggs come in so many colors?