I had a friend tell me that getting a flock of all different breeds was not a good idea, but I don't think she told me why. Is this true? Is there any reason not to mix n match breeds? I want 6 hens, and I would like 4-6 different breeds. Also, we have a fair amount of hawks...is there any reason they would go for the white hens any more than other colors (I would think movement on the ground is what catches their eye...not necessarily color). But I'm not a hawk specialist. Any advice is appreciated.