Ive been trying to figure this out. WHy are some of my RIR lighter? Does this have anything to do with the sex of the bird? Here's a picture of my 5 week olds. See the difference? I ordered all hens but I dont think thats what I got. I did try to find the answer here but only become more confused. One last question how do you get a good picture of young chicks without drugging the little buggers? Im kidding about drugging them.