We have fire ants here too, they call them “tiny fire ants” and have become a big problem. From what I understand if you see any ants you actually have to kill the queen and this requires poisoning every month for a year.
We’re supposed to report any ant sightings and then somebody from the county comes out with the poison and instructions. Not sure about toxicity to chickens. We thankfully haven’t seen any on our property, yet. Pretty sure I have rats up in the attic though, I haven’t seen any during the day yet but I hear them rearranging the furniture in the middle of the night.