When we purchased ours chicks at almost 2 weeks old, we were told that they were 99% positive we were getting 4 hens, now they are 10 wks old and one of them is looking more like a rooster, the tail is getting longer and swooping over and the chick is a little larger than the others, is there a way to know for sure before the crowing starts? I've gotten attached now and not sure I could give him (?) up.