I recently ran across several threads on the Backyard Chickens forum about weird eggs laid by hens. It turns out that these are not terribly uncommon, which is a good thing to know ahead of time!
First, some chicken biology on how an egg is formed. A chicken's ovary is like a cluster of grapes hanging over a funnel. When one of the "grapes"(follicles) matures into an ovum, it falls off the ovary and drops into the funnel. From there it travels down a long tube (the oviduct).
The "grape" (ovum) is the center of the egg, which becomes the yolk as the egg develops. As it travels down the oviduct, the other layers of the egg are laid around it. Imagine a car moving through an automatic car wash. Instead of getting a rinse, a soap and a wax, the yolk gets the egg white, then the membranes, and finally the shell.
Odd things can happen along the way. Most of us never see the results of these mis-steps, because we buy our eggs from the store. It's not like Lucerne is going to stick these weird eggs into your 12-pack!
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