So, I looked my into the reason why robins eggs are blue and it isn't really all that much about genetics but more about their pigment glands. And most birds have Pigment gland to help in coloration of the eggs. Now more into the specifics: there are three main types of pigments. One produces reds pinks and browns and yellows the other two green and blue shades. Putting them all in different ratios and proportions yields different shade eggs and marks. It's similar to the process of creating the offspring itself. A combination of sone genes and traits yeild different organisms! A few other cool rhings birds primarily on the ground lay brown eggs, birds that lay then in cavities like tree holes lay the typical white egg and nesting birds will lay green or bluish eggs.The forsake marks cab also help a mommybird identify her eggs, like our own little traits and charscteristics that distinguish us from others.
Next question: how is the ratio of pigments determined? Could it change if sso when?
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