Mother earth news has a great article about guinea fowl. They say “Compared to chickens, guinea fowl are low-cost and low-maintenance, and do a standout job as chemical-free pest control.”
Loads of information on them. Seems the kill ticks,rodents and even snakes so they would make good pest controllers.
Raising Guinea Fowl
http://www.motherearthnews.com/homesteading-and-livestock/raising-guinea-fowl-zmaz92aszshe.aspx#axzz2SkKRYPFi