I have three Black Sex Link Pullets from Ideal Poultry (RIR / Barred Plymouth Rock). As chicks they looked the same until their feathers started to come in. Then one was always the odd ball. They were hatched 8/28/13 so are seven weeks old right now . Two are nearly identical with black and brown. The other is nearly all black with specks of white and some brown feathers. Pics attached. Please help me determine if all three are hens or not.