Hi, my name is Debbie. I'm new at raising chickens. I got 10, 2week old babies from our local feed mill. They are 9 weeks old. We have 1 Delaware White, 5 brown Buckeye, and 4 black aus.(not sure how to spell) Just today one of my Aus crowed. I have read many posts and seen pics of both roo and hen. I can't tell the difference. Do hens crow?