Thanks for the help. I have a flock of birds of multiple generations. Today 1 bird a new layer who has probably laid a dozen eggs so far[she is my only green egg layer] was in the driveway and laid a egg without a shell. I haven't seen this before and was wondering if I need to be worried about anything. We are in the middle of a cold spell[single digits]??I haven't noticed anything strange going on lately. I appreciate any useful input, thanks