My four chickens (my first) are now about 7 months old and all are laying. I have a covered cat litter box in their run where they have all learned to lay their eggs. Three of them go in their and sit around until their egg is laid - usually takes half an hour. The fourth chicken, however, who is also the dominant one, goes in and out of the nextbox CONSTANTLY when she has to lay an egg -- steps out, turns around, goes in. She wil take little breaks to cry -- LOUD! Eventually the frequency of her in/out behaviour goes down, she settles down in her nest box, stops crying, and eventually, several hours later, she will have produced an egg and happily goes on with her life. It is the same story every day that she lays an egg. I guess it would be normal for chickens to have some variance in how easy/difficult it is to lay their eggs. I worry that there might be something wrong with her though, given how none of the other birds seem to go through that much angst. Any ideas?