My hopeful girls are about 4-5 weeks right now so I don't know that a picture will help since there really isn't anything to show. Two of the six chicks I have are RIR, one of which had a strip on the back of her head. The other does not have this mark. Since my kiddo is home sick today I went onto google and found that mark not being there means it's pretty likely I have a cockerel. I'm a bit panicked because per our city ordinance I can't have roosters. Other than the strip this chick is identical to my other RIR. Does anyone have experience with this gendering technique.