The Color of Eggs, Part III

As you can see from the photo, our Araucanas have begun laying their blue eggs. You may remember from our earlier post that most of our chickens did not begin laying until I explained fried chicken to them. araucana-egg-1-of-1.jpgThat did not work on the Araucanas and it wasn’t until this week that I figured out why: Araucanas are from Peru and don’t speak English. I don’t speak Quecha but fortunately both the chickens and I could communicate in Spanish. Can you say “fried chicken” in Spanish?

Which brings us to Part III of our series on the color of bird eggs. As we mentioned at the end of our last post in the series, scientists are not inclined to give credit to female avian artistry and look for scientific explanations of why birds go to the trouble of coloring their eggs. They don’t accept our “art hypothesis.”

Their answer is adaptation. The theory goes like this: To survive, bird eggs must protect the small birds inside until they can peck their way out. If egg-eating predators have an easy time finding the eggs, it is much less likely that little birds will live to hatch and then reproduce the species. After all, skunks don’t care whether the egg they eat today means no eggs for their grandchildren. (Or we assume they don’t.)

Like lawyers adducing evidence at trial, the scientists bring forth first, Exhibit A: the Killdeer, which lays eggs in the open. 13killdeereggs.jpg Such eggs would be easy sightings for visual predators unless well camouflaged, as Killdeer eggs are. Coupled with the small similarly marked and colored rocks which Killdeer frequently use to line their nests, the entire apparatus is practically invisible which obviously aids in Killdeer survival. (Killdeer are experts at distraction displays which we discussed briefly in our post about Rikki-tikki-tavi. They are ground nesters.)

Exhibit B consists of white eggs laid by birds which nest in dark holes such as Petrels, Woodpeckers, Kingfishers. White eggs are easier to see in the dark. Exhibit C brings more white eggs, this time of species which leave nests frequently but cover the eggs with grasses or other plants in the vicinity before leaving which hides the eggs from flying eyes.

But there is a hole in this theory and it is the White Leghorn hen, that prolific egg layer we and E.B. White talked about in the first post on egg color. The one who would stop to lay an egg even if she was on the way to a fire. If the purpose of egg color is camouflage to conceal the eggs from predators, who is in more need of that than a domestic chicken whose every egg is stolen from her by two legged mammals? Why does she lay white eggs visible for miles?  I think the scientists have a little way to go to finish their explanation. Given what we are learning about bird brains and how evolved they really are, perhaps scientists should take another look at our art hypothesis.

But I can hear them now, “It isn’t just chickens and birds that hide their eggs when they leave their nests who lay white eggs. Exhibit D contains the eggs of Hawks and Owls and other birds which begin incubating their eggs as soon as the first one hatches. No need to camouflage those because the parent is sitting on them.”

We’ll let you know the verdict when it comes in.


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10 Responses to “The Color of Eggs, Part III”

  1. KAY Says:


  2. fatfinch Says:

    Without knowing more about where you live and the size of the egg it is hard to help much. If it is as large as a chicken egg, that may well be what it is. If it is smaller, it is a wild bird egg. If you live in an area that Robins frequent, that is a likely suspect. But many other birds lay blue or turquoise eggs. Sorry not to have been of more help.

  3. Miki Says:

    Blue eggs = the ancestors of chickens that lay these came from South America. The Araucana is best known for laying blue eggs. A true Araucana is rumpless, having no tail at all (not even the fleshy part). A modern breed that lays blue eggs is the Ameraucana which does have a tail.

  4. emily Says:

    i found a nest that is 3 cm big and has a egg that is 1 cm big and’s a tiny spotted white and brown egg.what kind of bird may have lade this egg.

  5. dallas Says:

    i have some arauana chicken eggs u konow the blue ones

  6. Kris Says:

    I have found a very large egg. It’s larger than the palm of my hand and it’s very dark blue with very small lighter blue spots showing throught. It was found next to a pond with a creek running into it in the Western side of central Michigan. The membrane on this egg is also very thick. Would love to know what this is. Any ideas?

  7. Javier Says:

    Araucanas came from Chile, the name comes from “Arauco” theold spanish name for the mapuche indians… I miss those tuffed, shorted legs chickens… Normally in south they are raised with the Castillian types chickens… Very good mother hens… I remember how mom hen fought and made run a fox, even she got a good pluck of feathers off… The chicks all saved and I don’t know how they flew up to the trees… They were silent and peep out just when mom started to call them…

  8. Claire Schauer Says:

    May I use your beautiful picture of eggs in a power point. The slide has to do with egg allergies.

  9. Lesley Rippon Says:

    We r on holiday @ Cape St Fransis in the Eastern Cape South Africa & have found 3 small turquoise eggs with no markings each one by itself in the open on the flat ground in the back yard of the house we r in ~ anyone have any idea what bird it is ~ we also cant leave them there as in the road for us to park our vechicles in the garages.

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