This chicken is most likely a mixed breed, because the egg came from a mixed flock, but it is possible that is a full breed. The breed that I think it comes from is a Golden Cuckoo Maran. Both the female and the male look very similar in early stages. This chick is now 45 days old. I have looked at feathers, feet, eye color which is not a true color for a Golden Cuckoo Maran (reddish normally), and I still cannot tell. It is not aggressive to me or my husband. But we have younger chicks that it will pick on. Since Golden Cuckoo Maran have little differences in looks early on, I need ASAP if it is a rooster. I am quite fond of it already. It is so healthy and lovely soft feathers.