I got 3 chickens from a friend. They are maybe 3 mos old and my kids have already heard one crow (we believe it's a polish/Cochin cross) and I'm really hoping the one lacking a comb and wattle is a hen (maybe a polish/australorp cross). Haven't heard the sebright crow yet, but is showing some aggression toward the roo. Is the sebright also a roo? :-/