We have 3 wk old welsummers, and some were born dark chocolate almost with the blackish stripes, and some were born light tan with the black stripes. All have the dark back- they look like chipmunks to us! I read on someone's post that the hens are actually more colorful at hatching, and the roosters less so, then the roos change as they age. TRUE??? I am curious because I have to start thinking about who is going to go where. Can anyone tell me how to check vents for sex, how does that work?