I recently bought a mish mash of hens and I believe the blue black ones are Blue Americanas but not sure. Also are they pullets? They are skittish and seem to bully all or most of the other hens. Also the mixed color one.. no idea. Any idea on the white one? They were all together when i bought them. I was told they are all around 4 months old. None are laying yet. I know I have 3 RIR, 3 speckled sussex and 1 barred rock. A few others I am not sure of. These are my first chickens and I am loving it!