Why Are Egg Shells Different Colors?

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Some things we take for granted.  Take for instance eggs.  In the grocery store we find eggs with white shells and eggs with brown shells.  The Araucana chicken lays blue eggs.

But why so many colors?

It turns out that chickens lay eggs that are the same color as their earlobe. So chickens with red earlobes lay reddish-brown eggs and chickens with white earlobes lay white eggs.  Araucanas do not have blue earlobes, but they only lay blue eggs.  No matter what the color, all eggs share a similar nutritional value.