Hello, I am new to raising chickens. I just bought my first four baby chicks last week. They were five weeks old and the lady that sold them to me said they were to young to sex at the time. Well, I have watching them very closely since I bought hem. I handle them daily to make sure they get used to me. During this very short time, I have noticed that two of the chicks are significantly larger than the other two. Also, sometimes it looks as if the larger two are trying to mount the smaller two. Then tonight, the larger two chicks faced each other off, sort of bickering jumping up and down, feathers all ruffled up. I know that I am new to the whole chicken thing. But, I think I have to 6 week old roosters instead of all 4 being hens. Secondary sex characteristics are not yet noticeable with them. Is it possible to tell a baby rooster on just its behavior or alone. Or this behavior that I am seeing common to all chickens no matter if they are male or female? Thanks in advance.