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[Gene GeRue <genegerue AT ruralize.com>]

> Every time I hear the term "chicken tractor" I have a
> vision of a tractor powered by chickens in a
> treadmill.

Andy Lee popularized the chicken tractor and he and his lady, Pat 
Foreman, wrote a book about it:
http://www.amazon.com/gp/product/0962464864/qid=1149945153/sr=2-1/ref=pd_bbs_b_2_1/103-6334569-4165457?s=books&v=glance&n=283155

Many homesteaders and chicken raisers, including Joel Salatin, have 
found the chicken tractor a way to protect chickens while having them 
on fresh grass. In its simplest mode it is just a low box frame 
covered with poultry mesh that gets moved around in the pasture.