Ordinarily my two girls (who are about 18 weeks) get along just fine, with one clearly dominant and one submissive, but both very happy and affectionate with each other. But this morning they seem to have woken up in a bad mood -- I saw the submissive one peck the dominant one a bit, and they just seem to be annoyed with each other and are doing a little pecking, which I usually never see them do. They are in a run (I can't let them out today as I can't be outside with them to watch them), but since there are only two of them they have plenty of room to separate from each other, and they've never had this issue before. Do chickens just have days when they are cranky with each other sometimes? Are they put out by the fact that it is rainy? (Their run is covered and sand-lined, so they are dry, but there's no sun today, which I know they enjoy.) Is something else going on? Is this some kind of teenage thing?