One of my cornish X pullets has become super possesive of the nestbox that she's decided is hers and only hers. When she goes into it to lay and finds golfballs and (sometimes) other pullets eggs, she pushes them out before using the box. She's not accidently pushing them out, I've watched her. She very deliberately uses her beak and feet to push the eggs out before settling down to lay her own egg. If she sees me heading to the back of the coop, to the nestbox to check for eggs, she comes running and watches everything I do; giving me a healthy dose of stink eye the whole time. This morning I heard her raising a ruckus. I thought it was the egg song, so I went out there. She was screaming because another pullet had entered her box. This is going to create a problem because there is only one nestbox for the CXs and it is extra, EXTRA large. There is not enough room in the coop for another of the same size. Do you have any breed of chicken that is so possessive of the nestbox? I'm guessing that there is a breed somewhere in the CXs lineage that accounts for this strange behavior.