chook tractor
n.— «The “chook tractor” is a time old permaculture concept as far as i can tell. it can be as complex or simple as you like. but the basic principle is enclose the chooks where you want to plant a garden, feed them and leave them there for 1-3 months and they do all the scratching and turning over of the soil for you—fertilise it with their poo and eat all the weeds (including couch grass)—for basically nothing (and you get eggs!).» —“School kids and permaculture” by d_donahoo in Castlemaine, Victoria, Australia Permaculture discussion forum July 28, 2003. (source: Double-Tongued Dictionary)