I free range my chickens, but have little ones that are outside in mini tractors getting socialized.. having let them out of there is a problem of the older chickens wanting the chick food. The big chickens just get scratch down by the coop, the little ones don't venture that far.  Somebody was talking about having a chick area.. A covered area with a smallish opening that the big chickens can't get into. I think I may do something like that. Once I make my nicer and bigger outdoor brooder, I will have a small opening to let them out. Then the chicks can escape back in there and will be free from harassment. Though really, the harassers have only been my broody mommy and my older guinea. I feed back the eggshells down by the coop, with kitchen scraps, and have oyster shell they can get down there as well. Once they get a bit bigger, they will start venturing down there, but for now they stay close to their pen.