We have fire ants here too, they call them ātiny fire antsā 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.
Weāre 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 havenāt seen any on our property, yet. Pretty sure I have rats up in the attic though, I havenāt seen any during the day yet but I hear them rearranging the furniture in the middle of the night.