After looking at everyone's pictures, this might be like asking parents of multiples, "How do you tell them apart?" But how do you know how old and what hatch your birds come from? I haven't seen any leg bands or the like. Do you keep different ages separated into different pens? It's not to hard for me right now since I only have the two cockerels, the runt and crooked butt, and five pullets which vary enough in pattern in size to be fairly distinct. I imagine once you get to a dozen or so it's near impossible to tell them apart unless they're tagged in some manner.