chicken tractor
 n.— «A Chicken tractor is a chicken coop built on wheels and without a floor. This allow you to move the chickens around your orchard or yard on a regular basis. They eat the bugs, scratch and fertilize the soil and after a few days you move them to the next spot.  No cleaning the bottom of the cage etc.» —“Re: Misc rural questions” by Laura White in Albuquerque, New Mexico Usenet: misc.rural May 25, 1995. (source: Double-Tongued Dictionary)

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