I bought 3 birds last week, I was told 2 were RIR's and the same age. I have started to notice that one is more dominant, larger and has more profound tail feathers. The man I bought them from assured me that they were all 3 hens but as I watch them I have beguin to notice these suttle differences. I will also post a picture of my White (& buff?) Plymouth rock. I was also told she was a she....hopefully they all are Sorry i dont have a better pic of my PR it was almost roost time and she was trying to escape LoL!