We live on three acres in South Texas and have a lot of fire ants. My hens are free range so I cannot use anything like chemicals on any of the acres. I buy 50 lb bags of Food Grade DEA at a place that ironically makes pesticides. I then take a stick and push a hole into the ant nest (very carefully) and pour the DEA down the hole. When I come back later there is a pile of dead ants laying dead at the top of the mound. I call the hens over and they feast. DEA will not hurt hens and actually will keep the hens from getting worms.
A little note,....if you are going to free range as I do, you will need a dog to patrol the yard from raccoons, cayotes and hawks. I had to learn the hard way. Now that I have a rescue dog in the yard, I have not lost one hen. Hope you enjoy your chicks, you are now hooked!!!!
I should include that you will not need much of the DEA powder, about a half a cup to a cup and it is only $8. for 50 lbs down here. But I feed it to my chicks as soon as they hatch. I sprinkle it in their food. I have not had any problem with worms or with mites or any other kind of pest on my chickens in the 3 years since I started using the stuff.