I bought 6 RIR's and 6 Buff O's that were supposed to all be hens. They were 3 days old when I got them. It is now very apparent that one of the RIR's is a roo. He is only about 6 weeks and hasn't started crowing yet, but I have been observing his behavior and how it differs from the girls. He is very watchful, even in the covered run. In the evening, after I have put them up for the night, he will walk around and really look around, especially up in the air, as if looking for predators or danger. The girls will be getting some last snacks or drinks, or picking their roosting spots, but he is checking things out first! I didn't want any roosters due to their crowing (my husband works nights) and I didn't think I wanted to raise any babies (that has changed...but I want the mom's to do it-not me!), but I am rethinking the rooster part. He is not very friendly, doesn't let me touch him, but he will eat out of my hand. If he doesn't flog me and doesn't keep my husband awake, I think I will definitely keep him. He is pretty and already bigger than the rest of the hens. I've been calling him Boy Biddy, but that will have to change if I keep him. Does anyone know what a RIR/Buff O cross looks like? About what age do they start crowing? I have to go look at some RIR rooster pictures.