I am suspect of this chick since she/he is so large compared to my other chicks. I also assume that it is a week older than the rest so hopefully that is the case. It acts as if it is the mother hen and takes care of my other chicks. I have seen it become aggressive toward another chick but I think that the other one may be a roo for sure. I hope this image can help someone assist me with sexing me chick.