I was told this was an Australorp Rooster, but I'm not sure that he's actually a she. "It" tends to hang out with our hens, and stay away from the roosters, but our roosters tend to run from "it". So I'm not really sure, and any answers would be helpful. "It" is only about 4-5 months old.
Are all of these pics of the same bird? If so, that is definitely a roo. That is a boy tail for sure. You can't see the tail very well in the top pics.