I have 6 red sex-linked pullets 18-19 weeks old. They are showing signs of getting ready to lay (bright red combs, broadening bottoms). This morning 5 of them were away from their house on the far side of their yard and acting very agitated. One was by herself in the house. The other five were clucking and then starting scratching the dirt like crazy until they turned it into dust and then were laying in the dust and fluffing themselves around in it. I had never seen them do that before. I back out to check on them, and now they seem to have settled down some, but the one was still in the house by herself. What's up?