Today I found this perfectly round golf ball sized egg buried in one of my pens. I only found it because it was partially dug up. It was about 4+ inches under the top surface of the hole. I candled it and it looks like it has been in the ground for quite awhile. I could see the yolk but it was dark so I think it is rotten inside. I'm not going to break it open. I put the feathers in the bottom of the hole where I found the egg.