I have a hen sitting on 10 eggs, This morning she came out to do her business, and I took the opportunity to check on the eggs. She has been sitting for 7 days now. I noticed that one was a broken shell but still basically whole. So I pulled it out... It was a brown egg, but as I looked more closely, I noticed that under/inside it was a blue egg! And the shell of that egg was hard and intact! I got the eggs from a friend who has a silkie rooster (and maybe another, I don't remember) and, among, others, Ameracauna hens. So the only thing I can think of is that a blue egg laying hen was bred with a rooster whose hens of that same breed lay brown eggs - or vice versa. Any other ideas?? Odd, indeed... [note: as I was handling the egg to turn in around for pictures, the brown shell kept flaking off. When I first saw it, there were just some cracks, and a dime-sized piece gone] Freaky, huh??