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)
Further reading
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The emotional appeal of handwriting and the emotional reveal of animal phrases. Should children be taught cursive writing in school, or is their time better spent studying other things? A handwritten note and a typed one may use the very same words...