Recentlyi have noticed that one of my hens is always in the nesting box and now the other has started to copy. My other half went to let them out on to the grass but both of them where upstairs in the nesting box instead, i managed to find one egg but they won't move. Are they becoming broody? or could there be anything else happening? and how can i stop them? as they are becoming recluse, and not bothering with outside world!!!!!