More ideas from Bambulka
Chicken tunnel (chunnel). Can make it mobile and run it through the rows of the garden so they can eat the pests and weeds.

chickens in their DIY chicken tunnel. We live in a residential area, so to keep the chickens protected from hawks, dogs and other predators (and to keep them out of our neighbor's yard) we hook up their portable play-pen to the run and let them range.