We have four chickens in our garden that have been there for about 4 weeks. We are getting regular eggs and all seemed to be going well. However three days ago we noticed that one of them was sitting separately and has taken to sleeping in the nest box rather than on the perch with the others. Her eyes are still bright and she seems happy to roam the garden. We are not sure if we're just being over worried or if there is anything wrong. Any help would be appreciated by a family of newbie chicken keepers.