|Easter Egger pullets|
|single comb on left, pea comb on right|
So how do we get green eggs? Well there are actually only two colors of egg shell, blue and not blue. What I am talking about is the color of the shell itself, all the way through. If you open up a blue egg and look under the inside membrane, you can see that the inside is blue also. But when you look inside a brown egg the inside is white (genetically, "not blue"). You see in a blue egg the blue pigment is an integral part of the egg shell. However, in a brown egg the brown pigment is actually a coating put on the outside.
A green egg happens when a bird has the blue egg genes along with some of the brown egg genes. She makes a blue egg shell and then coats it with the brown coating. The shade of green it turns out to be depends on the brown genes and the amount of brown tint she adds.
And some of them have begun to lay already!