I adopted 2 young(3 months?) SLW 'pullets' from a local farm and I am a little worried about one of them. It has more white on it's neck/head and seems to have more white on the shoulders, also one thing i noticed that is different is that it's down on it's butt is lighter in color, more silver than the other one. The other is definitely a pullet, and it's butt down is black and it's much darker all over. Do the roo's usually have lighter down?