I went out to check my eggs today, and found an egg about the size of a large olive. All of my hens in that pen have been laying for awhile, and there's never been an egg like this. The only hen that hasn't laid yet is a marans, and the small egg was white, which means it must have been one of my leghorns. Is it common to sometimes get ridiculously small eggs? Even when they all first started to lay, they were normal size.