I have 5 New Hampshire chicks that are almost 3 weeks old. I noticed yesterday that one has a comb that's noticibly larger and getting just a hint of pink already, so I'm pretty sure it's a cockerel. Then I noticed that his tail has feathered in quite nicely already, and only one of the others has significant tail feathers, the rest still have virtually no tails. So I was curious, are the early tail feathers a characteristic of a rooster? I can post pics later if necesary.