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For 100s of years different species have been used for pest control, including the two-legged kind. Geese were used as guards by the Romans and are given credit for preventing the invasion of Rome by the Gauls. Various poultry species have been used for weeding cotton and tobacco fields.
Guinea fowl for tick control (Article in Countryside)
Got ticks & bugs? Get Guineas! (Backyard poultry magazine)
Information on Lyme Disease from the National Center for Infectious Diseases
Using geese to control weeds (Metzer Farms Duck and Goose hatchery)
Weeding with geese (University of Missouri)
Geese as weeders (FAO)
Using multi-species grazing, including poultry can play an important role in controlling sheep worms. Ruminants (other than sheep) serve as dead-end hosts to the sheep worm preventing the spread of larvae. Having poultry follow sheep in the rotation is another way to eliminate a lot of larvae.