At what age can you begin to tell them apart? I have RIR's and Delawares and the ones that feathered earliest are also the ones that have the bigges comb development. They are 8 weeks old. Also, do hens of the same breed have different size combs? I also have 2 Egyptian Fayoumis, one has a bigger comb than the other. I had ordered 2 hens and am hoping they didn't make a mistake. Thanks to all.