Basically, a chicken tractor is a portable chicken pen with an open bottom that allows the chickens to scratch out the weeds, eat the bugs, and deposit their rich fertilizer in an area to be used for a garden bed. Once the chickens have done their work, the "tractor" is moved to the next garden bed and they repeat the process.
Chicken tractors are so easy to build that you hardly need detailed instructions, but this web site has a nice collection of photos of over 70 different chicken tractors. There should be plenty of inspiration there to help you put together your own chicken tractor and get those hens working for you.
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