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My small  flock  of  Naked  neck  hens destroyed  most of  fire  ant  mounds around,  I,ve  seen once the action  when they were scratching,  and  fire  ants got  aggreviated  and defensive  starting to crawl  up   hens   legs stinging them,  but my  hens  responded  picking them up  from their legs and instantly swallowing them,   then they  continued to scratch,  until they got deeper  into the ants  nest exposing  tasty  larvae.  
Larvae made hens go nuts,    they  took  care of the larvae  in no  time  and then  ate  remaining  ants  even  the ants  tried to sting.
My hens did not give up,   they  exterminated  mound of fire ants.
I am in shock

! How many hens do you have? Were they all NN?
My regular hens have shown passing interest in ants, and I am pretty diligent in killing the mounds before they get too large.  There are the big fire ants,, that bite and sting. They clamp down their jaws in the skin and then repeatedly sting.  Those mounds are huge.  When I moved to TX I learned about the little fire ants, look like sugar ants but they eat protein and the mounds are more like loose soil than a hard tall thing.  They are really evident in clay soil, as all of sudden the grass/plant/weed is growing in loose soil that rises over the root area and is very grainy. The only thing that has worked isadding 1/2 C each Garrett juice and Orange oil to a gallon of water, shake well just before using. With your feet protected, attack  the mound with a shovel splitting it open and pour the entire gallon in and around the mound. Usually kills the mound, even when it is in my compost pile. It is toxic to all insects and probably no too good for the Chickens, so I block off the treated areas for a day or so.
I hate these small fire ants, when they bite it burns me for hours and I get small pustules that stay for nearly a week. Ugh!
Nice to hear that my babies that are housed in the garage, will hopefully make short work of the ants. At 4 weeks my NN babies scarf up the flies and little beetle bugs in the bedding. They do a real good job keeping it all stirred up. They will be outside by Halloween, with my other year old chickens.