I have three chickens. Two of them are 9 month old buff orpingtons and one of them is a 7 month old araucana. One of the buffs has been laying for about 3 months and the araucana has been laying for about 2 months. The problem is that the other buff has never laid an egg! Is this normal? Her comb is very light pink and the buff that's laying has a bright red comb, does that mean anything? these are my first chickens and I've been feeding them what the feed store has suggested (about a month ago a mix of layer pellets, oystershell and crumble and now just the layer pellets and oyster shell). I also have a light in the coop since the days have gotten so short. If none of them were laying I would think I was doing something wrong..but it's just the one. The other two lay an egg every day.