CCsRanch
Songster
That was interesting to watch, thanks! But you explained the unusualties better. I did have a young one lay an egg with no shell on it a couple of weeks ago. And have seen them laid on top of the pen/coop wire vs. in a nesting box. Maybe those were fart eggs too!Fairy, fart, wind, rooster eggs are usually from a tiny piece of tissue breaking loose from the reproductive tract, or an immature ova(yolk) and the body forms an egg around it. Color can be darker than 'normal' as the pigment coating released has to cover a much smaller area so is thicker. Can happen with any age layer, but more common with new or older layers.
I think it's explained in this excellent video, which is worth watching regardless: