I went to collect the eggs this morning and I found a tiny one. My Plymouth Rocks and Orpingtons are all reliable layers usually. They seem healthy and are eating the same. There's been some construction down the road that's got to be aggravating them, but they act the same as usual. I wonder what happened? It's the smallest egg that I've ever seen come out of a chicken coop. Surely a cowbird didn't get in there and lay her egg. I let my chickens out of their run during the day, but I still don't think a cowbird would risk being confronted by a much larger bird.