I received 5 year old hens on Friday, today is Sunday. They seem to have settled in alright. Two of them have laid 3 eggs in 2 days. I just went out to check on the girls. Three of them are laying on their side in the run. It appears as though they have done a bit of digging in the dirt. They will get up and move around a bit, but not far before laying on their side again. Is this normal behaviour or is there a problem with my hens?