I have several 3 week old chicks that could be roos (I ordered a male and female of each breed. The breeds are Australorp, Gold Phoenix, and Light Brown Leghorn.) I'm starting to see some changes in them, but I'm confused because the chicks with the larger combs have the shorter tails! Especially with the Phoenix, I would think the longer tail would indicate a roo, but the one with the longer tail has the shorter comb on that one too! So in general, do the combs or the tails grow first on the males?