I have a 5 month old (what I thought) was a pullet until this past week. Miss Pickles is a Speckled Sussex, and I had originally got 4 day old chicks back in April, two were VERY apparently little roos, the roo I had kept was well matured at 3 months and running around with all the usual aggressive mannerisms of any roo. The other little pullet I gave to my neighbour completely resembled mine, so I was convinced of 2 and 2. I have since found my young roos new homes and kept her as she was smaller in size, nice tiny comb/waddles, but granted she did always have some big, beefy looking legs but who am I to judge, haha. Looked 95%% like a little pullet, then this past week, out of the blue, she gets the big old tail feather, my husband asked me about it and I thought, NAH, but she did, it's very obvious, but she hasn't crowed. I have a Cochin roo that is out there making all kinds of noise and he is exactly the same age and since they mature slower (as he had well after all the little Sussex and Ameraucana roosters from the same hatch), I thought for sure she was a little hen in training! Then yesterday she tackled down my Buff Orpington pullet right in front of me and did his/her thing! NEVER HEARD THIS ONE CROW ONCE? Could this be because I don't have an overly agressive roo in there? My cochin roo is what I thought was the only one, and while he crows ALL day long and acts like any other roo, he is still much of a gentleman so I don't know if she's just butching up in his place or here I just have a VERY LATE bloomer, and was just seeing what I wanted to see! Too funny!