Hey,
I am in Eastover, NC. I have 7 chickens, 15 weeks old this Thursday. I have them in a run in the back yard but we let them out every morning to free range around in the 30x30 fenced in part of the yard. I noticed that since they have been back there, no ants. Not fire ants, not sugar ants, actually not anything that crawls, flys, hops, or jumps. A while back my wife found a big rock with a huge load of fire ant larvae on the bottom and of course lots of adults to go along with them. She dumped them in the back yard before I could stop her. The chickens waded right in, started eating the larvae. Then I noticed they started hoping around and pecking at their legs once the ants started biting. Didn't seem to hurt them though and they kept going back for more. At first we had flies around due to the manure and feed, but the flies don't even hang around any longer. So, I am not sure what kind of chickens you have, but my easter eggers, and sex-linked chickens love to eat ants and their insect relatives.
My biggest pest so far is all the extra squirrels that come around for the corn in the feed.
tvolsfan4life