I've got 2 light brahmas, bought as pullets. One has a slightly darker comb than the other, and I've noticed now that when I'm near them the one that is a bit redder, her head turns red. When I talk to them, or go away for a bit then come back it goes back to being pale pink. Why does it do that, and why do I notice it with only one? I've only ever had darker birds, isa brown, rhode island reds. Is it something I'm just noticing it because they are fairer birds? I got back and forth on her looking like a boy or not. Would that maybe be why?