We got 2 chickens from a local farm that turned out to both be roosters. We brought them back to the farm and they gave us 4 chicks. They said they were week old RIR chicks and sexted at a day old, all female. We have had them now for 8 weeks and one of our "girls" has a much larger comb than the other three and tends to ruffle her feathers a lot. Is this a hen or a roo?