i have a large backyard where my children play. it is fenced in! on the other side of the fence is my coop and run = chicken tractor. even beyond that is the 'pasture' that is not fenced in. i was wondering: will the chickens make a HUGE mess (7-10 hens) in the fenced in backyard? also...if i let them forage in the pasture that is not fenced in...will they roam too far? i live on a very busy road, but the pasture is 100'+ off the road and we live on 3.5 acres. i just did not know how 'far' chickens will roam and if i could 'catch' them if i let them in the pasture at times... i was also thinking of building a 'portable' fence??? it is necessary???