Nothing????!!!!! One of my Buff Orpingtons has been laying for about a week now, (sporadically) I noticed her on the nestbox this afternoon, and thought I would wait for her to lay her egg. She went about singing the egg song for about half an hour and then she really started to sing... let out a last "high note" and jumped off the nest and back outside to eat with everyone else, so I went in to retrieve the egg, and.... NO EGG???!!! Does anyone know why????