Hi - I am new to Backyard Chickens (both the forum and the chickens!!) and hope someone out there can help me. I 're-homed' some chickens a few months ago for a friend of mine who believed that the three of them were hens. The Plymouth Rock is now making very rooster-like noises and I have seen her/him get on top of one of my very small Isa-Brown hens. I have quarantined her/him today because the other hens (5 of them) seemed a bit scared. Can anyone tell me from the picture if it is indeed a rooster? I think its about 6 months old.