For a fact I think I know, that with the yellow ones their is a cockerel and pullet at least I think because I'm no expert but if I am wrong please tell me the breed they are or at least a assumption the other ones to black ones someone on this site told me they were barred rock if I'm wrong please correct me and if u can tell me their gender I'd be grateful I bought them in a petshop and if I'm not mistaken they are 7 weeks old at least when I posted on this site they said 3 and told me to wait a few weeks so I did and now I'm posting again someone please help