We are brand new to raising backyard hens and I suspect we may have a few roosters in the mix. We bought 6 baby chicks from a farm swap a couple months ago. One didn't make it and we has these 5 left. They were all the same size and I think they said they were all 3 weeks old at the time. Now, two of them are considerably bigger then the others, the white one and the orangish one behind him/her. Any idea on breed? We will have to give any roosters back as they are not allowed.