That is incredibly interesting! Has anyone had an EEr go between brown and green? We've got one that the kids swear lays brown now, when we knew she was laying green. I haven't caught her in the act, but I might be inclined to get an egg cam to see if we can sort it out. And even though there are times when she's in the box for a while and there will be a brown egg in there (too many sometimes to determine who is laying what besides color, lol), later on there will be a mystery green egg that I assume comes from her.