I have 5 banty mongrels that are 5 weeks old. I was trying to sex them by traits that are starting to show up. First of all, their wings and tails are coming in real well, but I noticed that they are getting a few very thick feathers on the back of their necks that look like their tails did when the tails started coming in. I was wondering if those are rooster neck feathers or if hens start out that way also. Another thing that I noticed is that a couple of the chicks will just jump up without warning and dart staight into the huddle of chicks with the neck feathers flared out and holding it's head as high as it can. Is that something hens will do also? Or does it sound like I may have all roosters on my hands. Any info would be great. Thanks.