Well, it’s so hard to guess sometimes. I have hens that are the same breed and age (2 Cochins and 2 Polish) and the 2 of each breed both have different size wattles or combs and that’s how I tell them apart. The ones that really get me are silkies. I heard a crow one day and ran outside and the young silkie I suspected was a roo was not the one crowing. It was a silkie I did not even suspect was a boy.