Now that you mention it
jaxs I do think I have heard that before. I believe TPWD was working on bringing back quail and horned toad populations in west Texas and it was linked to Red Harvester ants.
And pesticide application to combat Fire Ants in East texas did occur starting in the early 1970’s which is about when the quail population started declining.
But there are still Red Harvester ants in East Texas I am aware of but still not significant pops of quail. Are you saying the quail also eat the Red harvester ants?
I did find this from TPWD
https://tpwd.texas.gov/publications/pwdpubs/media/pwd_rp_w7000_1025.pdf
But it doesn’t talk about Red Ants. I’ll keep looking because I’m sure I’ve heard that before.