We bought these "girls" at 10-12 weeks of age. We were only looking for hens as we want them for laying. We are very new to this and have had a rough go after losing all but one to a predator the second night and having to replace them after re-inforcing the tractor. The older they get, the prettier they are... except for one who is being picked on (feathers being plucked). I think she is the only hen based on my very limited knowledge and reading online, but I'd love to hear I am wrong. They are 16-18 weeks old now, have not heard any crowing, but one has a deeper voice for sure. "Big Bertha" is in the first pic.... biggest bird we have, not as bright coloring as the others, but thick legs and huge. This is the one with the deeper voice. The others are so busy and starting to look a lot of like (actually there are 2 and 2 that are so similar that I'm having a hard time telling them apart. I did NOT get a picture of the one I am fairly certain is female, but she is the smallest by far and not as colorful.