Might be a boy, how old is it? With BR it's hard to tell because the females can sometimes develop large combs and the males can have small ones and of course the feather markings are the same, soooo....... But I've read that females can take on male traits like crowing, protecting, trying to mount & mate and can even develop spurs, so once again????? However, if it lays an egg, then there won't be any doubt, well I take that back, that's not true either, some say that if a roo isn't present that the alpha female can take on the male roll as I mentioned above and then even stop laying eggs, so therefore, maybe they'll never even ever start depending on the age and flock dynamics and then you'll never know. LOL!!!