I want to use my chickens to kill sections of lawn! If I leave 13 birds a 20x8 run on the lawn, can I count on them to destroy it? I know it sounds odd, but it is next to my garden where I want to expand. My pls is to move them yearly to a then different section of garden and allow them to be my weed and feed. Is this practical? Will they do a good job turning that kind of area to wasteland? Do I need to cut down on the area? Thank you for dealing with an odd bird.